MdePkg: Support IoFifo for Tdx guest in BaseIoLibIntrinsic

RFC: https://bugzilla.tianocore.org/show_bug.cgi?id=3429

Previously IoFifo functions are in X64/IoFifoSev.nasm which supports
both SEV guest and Legacy guest. IoLibFifo.c is introduced to support
SEV/TDX/Legacy guest in one binary. It checks the guest type in runtime
and call corresponding functions then.

Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Zhiguang Liu <zhiguang.liu@intel.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Erdem Aktas <erdemaktas@google.com>
Cc: James Bottomley <jejb@linux.ibm.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Signed-off-by: Min Xu <min.m.xu@intel.com>

MdePkg/Library/BaseIoLibIntrinsic/BaseIoLibIntrinsicSev.inf

@@ -31,6 +31,7 @@
   BaseIoLibIntrinsicInternal.h
   IoHighLevel.c
   IoLibTdx.h
+  IoLibSev.h
 
 [Sources.IA32]
   IoLibGcc.c    | GCC
@@ -44,6 +45,7 @@
   IoLibMsc.c    | MSFT
   IoLib.c
   IoLibInternalTdx.c
+  IoLibFifo.c
   X64/IoFifoSev.nasm
 
 [Packages]