rpi: vchiq is in staging

target/arm/kernel/raspberry-pi2

@@ -15,3 +15,4 @@ CONFIG_BCM_VCIO=y
 CONFIG_MAILBOX=y
 CONFIG_BCM2835_MBOX=y
 CONFIG_RASPBERRYPI_POWER=y
+CONFIG_STAGING=y

target/arm/kernel/raspberry-pi3

@@ -14,3 +14,4 @@ CONFIG_BCM_VCIO=y
 CONFIG_MAILBOX=y
 CONFIG_BCM2835_MBOX=y
 CONFIG_RASPBERRYPI_POWER=y
+CONFIG_STAGING=y