plat: marvell: armada: Move definition of mrvl_flash target to common marvell_common.mk file

Signed-off-by: Pali Rohár <pali@kernel.org>
Change-Id: If545b3812787cc97b95dbd61ed51c37d30c5d412
diff --git a/plat/marvell/armada/a8k/common/a8k_common.mk b/plat/marvell/armada/a8k/common/a8k_common.mk
index b7c7d84..857bd89 100644
--- a/plat/marvell/armada/a8k/common/a8k_common.mk
+++ b/plat/marvell/armada/a8k/common/a8k_common.mk
@@ -163,6 +163,5 @@
 	@$(DOIMAGE_LIBS_CHECK)
 	${Q}${MAKE} --no-print-directory -C ${DOIMAGEPATH}
 
-.PHONY: mrvl_flash
-mrvl_flash: ${BUILD_PLAT}/${BOOT_IMAGE} ${DOIMAGETOOL}
+${BUILD_PLAT}/${FLASH_IMAGE}: ${ROM_BIN_EXT} ${BUILD_PLAT}/${BOOT_IMAGE} ${DOIMAGETOOL}
 	${DOIMAGETOOL} ${DOIMAGE_FLAGS} ${BUILD_PLAT}/${BOOT_IMAGE} ${BUILD_PLAT}/${FLASH_IMAGE}