MdePkg: Correct EFI_BLOCK_IO_PROTOCOL_REVISION3 value

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=2961



The value of EFI_BLOCK_IO_PROTOCOL_REVISION3 is currently
0x00020031. However, the value assigned in the UEFI Specification
2.8B is ((2<<16) | (31)) which is 0x0002001F.

Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Zhiguang Liu <zhiguang.liu@intel.com>
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>
Reviewed-by: Zhiguang Liu <zhiguang.liu@intel.com>