PC-BSD/trueos aa6a2bestand/efi/libefi efi_console.c

MFC r351695-r351696

r351695:
loader.efi: some systems do not translate scan code 0x8 to backspace

Add scancode translation for backspace.

r351696:
loader.efi: use and prefer coninex interface

Add support for EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL.
DeltaFile
+74-12stand/efi/libefi/efi_console.c
+74-121 files

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