[PATCH -next] remoteproc: imx_rproc: fix build error without CONFIG_MAILBOX

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Fix build error when CONFIG_MAILBOX is not set:

arm-linux-gnueabi-ld: drivers/remoteproc/imx_rproc.o: in function `imx_rproc_kick':
imx_rproc.c:(.text+0x328): undefined reference to `mbox_send_message'
arm-linux-gnueabi-ld: drivers/remoteproc/imx_rproc.o: in function `imx_rproc_probe':
imx_rproc.c:(.text+0x52c): undefined reference to `mbox_request_channel_byname'
arm-linux-gnueabi-ld: imx_rproc.c:(.text+0x548): undefined reference to `mbox_request_channel_byname'
arm-linux-gnueabi-ld: imx_rproc.c:(.text+0x76c): undefined reference to `mbox_free_channel'
arm-linux-gnueabi-ld: imx_rproc.c:(.text+0x774): undefined reference to `mbox_free_channel'
arm-linux-gnueabi-ld: imx_rproc.c:(.text+0x7c4): undefined reference to `mbox_free_channel'
arm-linux-gnueabi-ld: drivers/remoteproc/imx_rproc.o: in function `imx_rproc_remove':
imx_rproc.c:(.text+0x86c): undefined reference to `mbox_free_channel'
arm-linux-gnueabi-ld: imx_rproc.c:(.text+0x874): undefined reference to `mbox_free_channel'
make: *** [Makefile:1292: vmlinux] Error 1

Fixes: 2df7062002d0 ("remoteproc: imx_proc: enable virtio/mailbox")
Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Signed-off-by: Wei Yongjun <weiyongjun1@xxxxxxxxxx>
---
 drivers/remoteproc/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
index 7cf3d1b40c55..e68fcedc999c 100644
--- a/drivers/remoteproc/Kconfig
+++ b/drivers/remoteproc/Kconfig
@@ -26,6 +26,7 @@ config REMOTEPROC_CDEV
 config IMX_REMOTEPROC
 	tristate "i.MX remoteproc support"
 	depends on ARCH_MXC
+	select MAILBOX
 	help
 	  Say y here to support iMX's remote processors via the remote
 	  processor framework.




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