kinetis: set kernel version

target/config/Config.in.kernelversion

@@ -226,6 +226,7 @@ config ADK_TARGET_KERNEL_GIT_VER
 	default "4.4.34-1-v7+" if ADK_TARGET_BOARD_BCM28XX
 	default "3.14.79-1+" if ADK_TARGET_SYSTEM_SOLIDRUN_IMX6
 	default "4.4.37-1+" if ADK_TARGET_SYSTEM_BEAGLEBONE_BLACK
+	default "2.6.33" if ADK_TARGET_SYSTEM_KINETIS_K70
 
 config ADK_TARGET_KERNEL_GIT_TYPE
 	string