remoteproc: scp: add COMPILE_TEST dependency

This will improve this driver's build coverage.
Reported-by: Ezequiel Garcia <ezequiel@collabora.com>
Signed-off-by: Alexandre Courbot <acourbot@chromium.org>
Link: https://lore.kernel.org/r/20200915012911.489820-1-acourbot@chromium.orgSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

drivers/remoteproc/Kconfig

@@ -43,7 +43,7 @@ config INGENIC_VPU_RPROC
 
 config MTK_SCP
 	tristate "Mediatek SCP support"
-	depends on ARCH_MEDIATEK
+	depends on ARCH_MEDIATEK || COMPILE_TEST
 	select RPMSG_MTK_SCP
 	help
 	  Say y here to support Mediatek's System Companion Processor (SCP) via