Reset ConIn on ConfApp entrypoint (#317)

## Description

This change added a reset call to reset the simple text input protocol
installed on the gST->ConInHandle. This is needed to offset any
potential dangling voltage on the serial lines after a reset, etc.

- [x] Impacts functionality?
- **Functionality** - Does the change ultimately impact how firmware
functions?
- Examples: Add a new library, publish a new PPI, update an algorithm,
...
- [ ] Impacts security?
- **Security** - Does the change have a direct security impact on an
application,
    flow, or firmware?
  - Examples: Crypto algorithm change, buffer overflow fix, parameter
    validation improvement, ...
- [ ] Breaking change?
- **Breaking change** - Will anyone consuming this change experience a
break
    in build or boot behavior?
- Examples: Add a new library class, move a module to a different repo,
call
    a function in a new library class in a pre-existing module, ...
- [ ] Includes tests?
  - **Tests** - Does the change include any explicit test code?
  - Examples: Unit tests, integration tests, robot tests, ...
- [ ] Includes documentation?
- **Documentation** - Does the change contain explicit documentation
additions
    outside direct code modifications (and comments)?
- Examples: Update readme file, add feature readme file, link to
documentation
    on an a separate Web page, ...

## How This Was Tested

This was tested on a proprietary hardware platform.

## Integration Instructions

N/A

SetupDataPkg/ConfApp/ConfApp.c

@@ -357,6 +357,12 @@ ConfAppEntry (
     goto Exit;
   }
 
+  // This will be the serial ConIn, which could have some potential noise on the line, reset it before reading
+  Status = mSimpleTextInEx->Reset (mSimpleTextInEx, FALSE);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "Unable to reset SimpleTextIn on ConIn. Code = %r.\n", Status));
+  }
+
   Status = GetPlatformKeyStore (&mSecureBootKeys, &mSecureBootKeysCount);
   if (EFI_ERROR (Status)) {
     DEBUG ((DEBUG_ERROR, "Failed to get platform secure boot keys. Code = %r.\n", Status));

SetupDataPkg/ConfApp/UnitTest/ConInConOut.c

@@ -52,6 +52,13 @@ MockReadKey (
   OUT EFI_KEY_DATA                       *KeyData
   );
 
+EFI_STATUS
+EFIAPI
+MockReset (
+  IN EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL  *This,
+  IN BOOLEAN                            ExtendedVerification
+  );
+
 EFI_SIMPLE_TEXT_OUTPUT_MODE  MockMode = {
   .CursorColumn = 5,
   .CursorRow    = 5,
@@ -120,6 +127,7 @@ EFI_SYSTEM_TABLE  MockSys = {
 };
 
 EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL  MockSimpleInput = {
+  .Reset           = MockReset,
   .ReadKeyStrokeEx = MockReadKey,
   .WaitForKeyEx    = (EFI_EVENT)(UINTN)0xDEADBEEF,
 };
@@ -144,3 +152,25 @@ MockReadKey (
   CopyMem (KeyData, MockKey, sizeof (EFI_KEY_DATA));
   return EFI_SUCCESS;
 }
+
+/**
+  Mock instance of Reset function.
+
+  @param  This                 Protocol instance pointer.
+  @param  ExtendedVerification Driver may perform diagnostics on reset.
+
+  @retval EFI_SUCCESS          The device was reset.
+  @retval EFI_DEVICE_ERROR     The device is not functioning properly and could not be reset.
+
+**/
+EFI_STATUS
+EFIAPI
+MockReset (
+  IN EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL  *This,
+  IN BOOLEAN                            ExtendedVerification
+  )
+{
+  assert_ptr_equal (This, &MockSimpleInput);
+
+  return EFI_SUCCESS;
+}