Fix a calculation problem in IGD RMRR memory.
Cc: Zeng Star <zeng.star@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jiewen Yao <jiewen.yao@intel.com>
Reviewed-by: Zeng Star <zeng.star@intel.com>
(cherry picked from commit c13cb4aebf
)