DynamicTablesPkg: add validation for PcdNonBsaCompliant16550SerialHid

According to ACPI 6.4, 6.1.5 _HID states:

  - A valid PNP ID must be of the form "AAA####" where A is an uppercase
    letter and # is a hex digit.
  - A valid ACPI ID must be of the form "NNNN####" where N is an uppercase
    letter or a digit ('0'-'9') and # is a hex digit.

Signed-off-by: Joey Gouly <joey.gouly@arm.com>
Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>

DynamicTablesPkg/Library/Common/SsdtSerialPortFixupLib/SsdtSerialPortFixupLib.c

@@ -148,6 +148,10 @@ FixupIds (
       // If there is a non-BSA compliant HID, use that.
       NonBsaHid = (CONST CHAR8*)PcdGetPtr (PcdNonBsaCompliant16550SerialHid);
       if ((NonBsaHid != NULL) && (AsciiStrLen (NonBsaHid) != 0)) {
+        if (!(IsValidPnpId (NonBsaHid) || IsValidAcpiId (NonBsaHid))) {
+          return EFI_INVALID_PARAMETER;
+        }
+
         HidString = NonBsaHid;
         CidString = "";
       } else {