Allow passing extra arguments via QEMU_EXTRA_ARGS

It can sometimes be useful to pass extra arguments to the QEMU that is
launched via the 'run-only' target. Support this via an environment
variable QEMU_EXTRA_ARGS, which can be used like:
 make run-only QEMU_PATH=path/to/qemu/directory QEMU_EXTRA_ARGS='args here'

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Joakim Bech <joakim.bech@linaro.org>

qemu.mk

@@ -216,7 +216,7 @@ run-only:
 		-serial tcp:localhost:54320 -serial tcp:localhost:54321 \
 		-s -S -machine virt -cpu cortex-a15 \
 		-m 1057 \
-		-bios $(ROOT)/out/bios-qemu/bios.bin
+		-bios $(ROOT)/out/bios-qemu/bios.bin $(QEMU_EXTRA_ARGS)
 
 
 ifneq ($(filter check,$(MAKECMDGOALS)),)