while COMPILE_TEST is y and MAILBOX is n, build fails:

ERROR: modpost: "mbox_request_channel_byname" [drivers/media/platform/amphion/amphion-vpu.ko] undefined!
ERROR: modpost: "mbox_free_channel" [drivers/media/platform/amphion/amphion-vpu.ko] undefined!
ERROR: modpost: "mbox_send_message" [drivers/media/platform/amphion/amphion-vpu.ko] undefined!

Adding a MAILBOX dependency in VIDEO_AMPHION_VPU to fix this.

Fixes: 52b3a219dd4a ("media: platform: amphion: move config to its own file")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
---
 drivers/media/platform/amphion/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/platform/amphion/Kconfig b/drivers/media/platform/amphion/Kconfig
index 6eea97b7063a..4a363e07ccc9 100644
--- a/drivers/media/platform/amphion/Kconfig
+++ b/drivers/media/platform/amphion/Kconfig
@@ -7,7 +7,7 @@ config VIDEO_AMPHION_VPU
 	depends on V4L_MEM2MEM_DRIVERS
 	depends on ARCH_MXC || COMPILE_TEST
 	depends on MEDIA_SUPPORT
-	depends on VIDEO_DEV
+	depends on VIDEO_DEV && MAILBOX
 	select MEDIA_CONTROLLER
 	select V4L2_MEM2MEM_DEV
 	select VIDEOBUF2_DMA_CONTIG
-- 
2.17.1