board: dragonboard820c: use LINUX_KERNEL_IMAGE_HEADER

db820c predated support for prepending the kernel image header
automatically, drop it's custom linker script and head.S in favour of
this generic support.

Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
diff --git a/arch/arm/mach-snapdragon/Kconfig b/arch/arm/mach-snapdragon/Kconfig
index ad66710..f897c39 100644
--- a/arch/arm/mach-snapdragon/Kconfig
+++ b/arch/arm/mach-snapdragon/Kconfig
@@ -45,6 +45,7 @@
 
 config TARGET_DRAGONBOARD820C
 	bool "96Boards Dragonboard 820C"
+	select LINUX_KERNEL_IMAGE_HEADER
 	imply CLK_QCOM_APQ8096
 	imply PINCTRL_QCOM_APQ8096
 	imply BUTTON_QCOM_PMIC