Add minimal support for the MIPS Malta CoreLV board
emulated by Qemu. The only supported peripherial is
the UART.

This is enough to boot U-Boot to the command prompt
both in little and big endian mode.
Signed-off-by: NGabor Juhos <juhosg@openwrt.org>
Cc: Daniel Schwierzeck <daniel.schwierzeck@googlemail.com>