package/rpi-firmware: bump version

Bump bootloader and GPU firmware for misc fixes:
  - cec fixes
  - DTS buffering
  - others (pause_burst_frames enabled by default. WTF is that?)

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/rpi-firmware/rpi-firmware.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-RPI_FIRMWARE_VERSION = 5343d029a5f2f09bd9801914eac0d4bf95cadc1f
+RPI_FIRMWARE_VERSION = 18a163f9341755b00841312af2878afeb64c131c
 RPI_FIRMWARE_SITE = http://github.com/raspberrypi/firmware/tarball/$(RPI_FIRMWARE_VERSION)
 RPI_FIRMWARE_LICENSE = BSD-3c
 RPI_FIRMWARE_LICENSE_FILES = boot/LICENCE.broadcom