[console] Add keymap generator

Inspired by LILO's keytab-lilo.pl, genkeymap.pl uses "loadkeys -b" to
obtain a Linux keyboard map, and generates a file keymap_xx.c in
hci/keymap.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/Makefile

@@ -45,6 +45,7 @@ ELF2EFI64	:= ./util/elf2efi64
 EFIROM		:= ./util/efirom
 ICCFIX		:= ./util/iccfix
 EINFO		:= ./util/einfo
+GENKEYMAP	:= ./util/genkeymap.pl
 DOXYGEN		:= doxygen
 BINUTILS_DIR	:= /usr
 BFD_DIR		:= $(BINUTILS_DIR)
@@ -80,6 +81,7 @@ SRCDIRS		+= tests
 SRCDIRS		+= crypto crypto/axtls crypto/matrixssl
 SRCDIRS		+= hci hci/commands hci/tui
 SRCDIRS		+= hci/mucurses hci/mucurses/widgets
+SRCDIRS		+= hci/keymap
 SRCDIRS		+= usr
 SRCDIRS		+= config