MdePkg/UefiSpec: separate page access bitmask from SP and CRYPTO caps

MdePkg/UefiSpec: separate page access bitmask from SP and CRYPTO caps

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=2982

Operating systems are capable of treating SP and CRYPTO memory capabilities
and not as attributes. This means that these capabilites cannot be hidden
from OSs. For this reason, the SP and CRYPTO bits should be separated from
the bitmask that we use for hiding the page-access attributes.
Common mask for ATTRIBUTES was introduced in
3bd5c994c879f78e8e3d5346dc3b627f199291aa

Signed-off-by: Malgorzata Kukiello <jacek.kukiello@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Zhiguang Liu <zhiguang.liu@intel.com>
Cc: Oleksiy Yakovlev <oleksiyy@ami.com>
Cc: Ard Biesheuvel (ARM address) <ard.biesheuvel@arm.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>