MdePkg: Update EFI_RESOURCE_ATTRIBUTE_READ_ONLY_PROTECTABLE to 0x00080000

MdePkg: Update EFI_RESOURCE_ATTRIBUTE_READ_ONLY_PROTECTABLE to 0x00080000

Previous PI spec (< PI1.4a) has EFI_RESOURCE_ATTRIBUTE_PERSISTENT and
EFI_RESOURCE_ATTRIBUTE_READ_ONLY_PROTECTABLE with same value 0x00800000.

To resolve the conflict, PI1.4a updated
EFI_RESOURCE_ATTRIBUTE_READ_ONLY_PROTECTABLE to 0x00080000, this patch
is to follow PI1.4a spec to update the code.

Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>