zynq: switch to kernel 4.14

Also, remove the source-only qualifier

Run-tested: ZedBoard

Signed-off-by: Luis Araneda <luaraneda@gmail.com>

target/linux/zynq/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 ARCH:=arm
 BOARD:=zynq
 BOARDNAME:=Xilinx Zynq 7000 SoCs
-FEATURES:=fpu gpio rtc usb usbgadget ramdisk targz source-only
+FEATURES:=fpu gpio rtc usb usbgadget ramdisk targz
 CPU_TYPE:=cortex-a9
 CPU_SUBTYPE:=neon
 MAINTAINER:=Jason Wu <jason.wu.misc@gmail.com>
@@ -20,7 +20,7 @@ define Target/Description
 	Build firmware image for Zynq 7000 SoC devices.
 endef
 
-KERNEL_PATCHVER:=4.4
+KERNEL_PATCHVER:=4.14
 
 include $(INCLUDE_DIR)/target.mk