UefiPayloadPkg: Align SpecRevision value with UPL spec

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3933
URL: https://universalpayload.github.io/documentation/

1. Currently, SpecRevision on USF spec is 0.7. Change to align it.
2. SpecRevision is not be patched into UniversalPayloadInfo.bin due to
different structure item name. Change item name from "HeaderRevision"
 to "SpecRevision" to check the correct value can be patched.

Reviewed-by: Ray Ni <ray.ni@intel.com>
Reviewed-by: Guo Dong <guo.dong@intel.com>
Signed-off-by: Gua Guo <gua.guo@intel.com>

UefiPayloadPkg/UniversalPayloadBuild.py

@@ -31,7 +31,7 @@ class UPLD_INFO_HEADER(LittleEndianStructure):
     def __init__(self):
         self.Identifier     =  b'PLDH'
         self.HeaderLength   = sizeof(UPLD_INFO_HEADER)
-        self.HeaderRevision = 0x0075
+        self.SpecRevision   = 0x0007
         self.Revision       = 0x0000010105
         self.ImageId        = b'UEFI'
         self.ProducerId     = b'INTEL'