Call LegacyBiosInstallVgaRom to shadow Legacy VBIOS instead of LegacyBiosInstallPciRom during legacy boot.

Signed-off-by: Li Elvin <elvin.li@intel.com>
Reviewed-by: Ni Ruiyu <ruiyu.ni@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@14205 6f19259b-4bc3-4df7-8a09-765794883524
Update the logic: 
  Not remove the form set data, add check before browser use form set data to avoid use the useless form set data.

Signed-off-by: Eric Dong <eric.dong@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@14206 6f19259b-4bc3-4df7-8a09-765794883524
Revert error check in code by patch 14206.

Signed-off-by: Eric Dong

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@14207 6f19259b-4bc3-4df7-8a09-765794883524
Refine the logic about gFunctionKeySetting, avoid some HII drivers can't show the hotkey info.
Also add missing code in UI.c

Signed-off-by: Eric Dong <eric.dong@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@14208 6f19259b-4bc3-4df7-8a09-765794883524
Add the backslash to C12 mapping in keyboard layout mapping table to fix the issue that backslash doesn't work when using HP KU-0316 USB key board.

Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Ting Ye <ting.ye@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@14209 6f19259b-4bc3-4df7-8a09-765794883524