MdeModulePkg/HiiDatabase: Update HiiImage to support PNG/JPEG

MdeModulePkg/HiiDatabase: Update HiiImage to support PNG/JPEG

1. Update GetImageIdOrAddress() to recognize PNG/JPEG image block.
   A offset calculation bug was fixed.
2. Update HiiGetImage() comments to say PNG/JPEG support is provided
   by HiiImageEx
3. Update HiiSetImage() to support replacing a PNG/JPEG image block
   with a new image

Contributed-under: TianoCore Contribution Agreement 1.0
Reviewed-by: Liming Gao <liming.gao@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Dandan Bi <dandan.bi@intel.com>
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>