enable required kernel symbols for rpi

target/arm/kernel/raspberry-pi

@@ -7,9 +7,15 @@ CONFIG_KUSER_HELPERS=y
 CONFIG_ARCH_MULTI_V6=y
 CONFIG_ARCH_BCM2708=y
 CONFIG_MACH_BCM2708=y
-CONFIG_BCM2708_VCMEM=y
-CONFIG_BCM2708_DMAER=y
+CONFIG_BCM2708_DT=y
 CONFIG_RASPBERRYPI_FIRMWARE=y
+CONFIG_BRCM_CHAR_DRIVERS=y
+CONFIG_BCM2708_NOL2CACHE=y
+CONFIG_BCM2708_DMAER=y
 CONFIG_BCM2708_VCHIQ=y
-CONFIG_BCM2708_DT=y
+CONFIG_BCM2708_VCMEM=y
+CONFIG_MAILBOX=y
+CONFIG_BCM2835_MBOX=y
+CONFIG_OF=y
+CONFIG_OF_OVERLAY=y
 CONFIG_CMDLINE_FROM_BOOTLOADER=y