In V2, Remove GetImageReadFunction(), directly use PeiImageRead().
The copy PeiImageReadForShadow function doesn't improve the boot performance.
This patch removes this copy logic to simplify the code logic.
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>