[source] brcm47xx: bump kernel to 4.4

[LEDE Commits]

rmilecki pushed a commit to source.git, branch master:
https://git.lede-project.org/06405df7a8da24b7d735b32454c7d3b1f2ebaabc

commit 06405df7a8da24b7d735b32454c7d3b1f2ebaabc
Author: Rafał Miłecki <rafal at milecki.pl>
AuthorDate: Mon Oct 24 17:03:48 2016 +0200

    brcm47xx: bump kernel to 4.4
    
    Kernel 4.4 was ready for brcm47xx for almost a year now but I kept
    postponing the bump due to problems with Linksys WRT300N v1.0. OpenWrt
    and LEDE with 4.4 were hanging at the booting with the:
    > Starting program at 0x80001000
    (the last CFE message).
    
    This was a permanent state, "make distclean" wasn't helping, I spent
    hours debugging this and I was reliably reproducing the issue every
    time. I also reported it on linux-mips ML in the thread:
    > BCM4704 stopped booting with 4.4 (due to vmlinux size?)
    
    After ~month I started working on WRT300N again. I got hangs as expected
    every time I switched from 4.1 to 4.4. I started experimenting with:
    1) TRX content (I tried dropping rootfs partition)
    2) BZ_TEXT_START of lzma-loader
    3) Flashing other variants of image: lzma compressed kernel (without a
       loader), gzip compressed one, uncompressed one.
    
    At some point I got rootfs-less image booting and after that I couldn't
    reproduce problem anymore, even with a complete firmware. It seems like
    hardware was in some locked/unstable state that got magically fixed.
    
    I have LEDE working now, tested it even with "make distclean", it seems
    we can bump kernel now. I'll keep testing it on WRT300N for some time.
    
    Signed-off-by: Rafał Miłecki <rafal at milecki.pl>
---
 target/linux/brcm47xx/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/target/linux/brcm47xx/Makefile b/target/linux/brcm47xx/Makefile
index cb6d39f..73b7bff 100644
--- a/target/linux/brcm47xx/Makefile
+++ b/target/linux/brcm47xx/Makefile
@@ -13,7 +13,7 @@ FEATURES:=squashfs usb
 SUBTARGETS:=generic mips74k legacy
 MAINTAINER:=Hauke Mehrtens <hauke at hauke-m.de>
 
-KERNEL_PATCHVER:=4.1
+KERNEL_PATCHVER:=4.4
 
 define Target/Description
 	Build firmware images for Broadcom based BCM47xx/53xx routers with MIPS CPU, *not* ARM.