kernel: remove linux 4.4 support

No targets are using this one anymore

Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com>

include/kernel-version.mk

@@ -3,12 +3,10 @@
 LINUX_RELEASE?=1
 
 LINUX_VERSION-3.18 = .71
-LINUX_VERSION-4.4 = .121
 LINUX_VERSION-4.9 = .118
 LINUX_VERSION-4.14 = .61
 
 LINUX_KERNEL_HASH-3.18.71 = 5abc9778ad44ce02ed6c8ab52ece8a21c6d20d21f6ed8a19287b4a38a50c1240
-LINUX_KERNEL_HASH-4.4.121 = 44a88268b5088dc326b30c9b9133ac35a9a200b636b7268d08f32abeae6ca729
 LINUX_KERNEL_HASH-4.9.118 = 7df789e40c6040cd6f6e34326f477b389ab7eaf2bb04940fca4bbe5e733add57
 LINUX_KERNEL_HASH-4.14.61 = 0d0ec521a771e7d393f25b789a06d9af6e2a5a4837fadc04e7048e03b41c70e8
 

include/target.mk

@@ -51,7 +51,7 @@ else
   endif
 endif
 
-ifneq ($(filter 3.18 4.4 4.9,$(KERNEL_PATCHVER)),)
+ifneq ($(filter 3.18 4.9,$(KERNEL_PATCHVER)),)
   DEFAULT_PACKAGES.router:=$(filter-out kmod-ipt-offload,$(DEFAULT_PACKAGES.router))
 endif