rpmsg: add rpmsg support for mt8183 SCP.

Add a simple rpmsg support for mt8183 SCP, that use IPI / IPC directly.

Signed-off-by: Pi-Hsun Shih <pihsun@chromium.org>
Link: https://lore.kernel.org/r/20191112110330.179649-4-pihsun@chromium.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
index 85d594d..de3862c 100644
--- a/drivers/remoteproc/Kconfig
+++ b/drivers/remoteproc/Kconfig
@@ -26,6 +26,7 @@
 config MTK_SCP
 	tristate "Mediatek SCP support"
 	depends on ARCH_MEDIATEK
+	select RPMSG_MTK_SCP
 	help
 	  Say y here to support Mediatek's System Companion Processor (SCP) via
 	  the remote processor framework.