https://bugzilla.tianocore.org/show_bug.cgi?id=263
Fix IA32 build issues in the PlatformFlashAccessLib. Some of the
UINT64 FLASH addresses values need to be typecast to UINTN.
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: David Wei <david.wei@intel.com>
Cc: Mang Guo <mang.guo@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Michael Kinney <michael.d.kinney@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>