brcm2708: switch to linux 4.9

Signed-off-by: Álvaro Fernández Rojas <[email protected]>

target/linux/brcm2708/Makefile

@@ -14,7 +14,7 @@ FEATURES:=ext4 audio usb usbgadget display gpio fpu
 MAINTAINER:=Álvaro Fernández Rojas <[email protected]>
 SUBTARGETS:=bcm2708 bcm2709 bcm2710
 
-KERNEL_PATCHVER:=4.4
+KERNEL_PATCHVER:=4.9
 
 define Target/Description
 	Build firmware image for Broadcom BCM27xx SoC devices.