OvmfPkg/PlatformPei: Refactor QemuUc32BaseInitialization

OvmfPkg/PlatformPei: Refactor QemuUc32BaseInitialization

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3863

Rename QemuUc32BaseInitialization to PlatformQemuUc32BaseInitialization.
This function is for PlatformInitLib.

Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Jordan Justen <jordan.l.justen@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>
Cc: Sebastien Boeuf <sebastien.boeuf@intel.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Signed-off-by: Min Xu <min.m.xu@intel.com>