configs/imx28evk: Update U-Boot and kernel versions

Update U-Boot to 2016.09.01 and kernel to 4.8.4 version.

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

configs/freescale_imx28evk_defconfig

@@ -2,8 +2,8 @@
 BR2_arm=y
 BR2_arm926t=y
 
-# Linux headers same as kernel, a 3.19 series
-BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_3_19=y
+# Linux headers same as kernel, a 4.8 series
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_4_8=y
 
 # system
 BR2_TARGET_GENERIC_GETTY_PORT="ttyAMA0"
@@ -11,7 +11,7 @@ BR2_TARGET_GENERIC_GETTY_PORT="ttyAMA0"
 # kernel
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION=y
-BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="3.19.2"
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.8.4"
 BR2_LINUX_KERNEL_DEFCONFIG="mxs"
 BR2_LINUX_KERNEL_DTS_SUPPORT=y
 BR2_LINUX_KERNEL_INTREE_DTS_NAME="imx28-evk"
@@ -20,5 +20,5 @@ BR2_LINUX_KERNEL_INTREE_DTS_NAME="imx28-evk"
 BR2_TARGET_UBOOT=y
 BR2_TARGET_UBOOT_BOARDNAME="mx28evk"
 BR2_TARGET_UBOOT_CUSTOM_VERSION=y
-BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2015.01"
+BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2016.09.01"
 BR2_TARGET_UBOOT_FORMAT_SD=y