qcom: Don't enable LINUX_KERNEL_IMAGE_HEADER by default

Enabling LINUX_KERNEL_IMAGE_HEADER by default doesn't allow
ENABLE_ARM_SOC_BOOT0_HOOK to work properly on db410c when U-Boot is
loaded as a first stage bootloader. It leads to secondary CPUs bringup
failure and later causing the Linux kernel to freeze.

So fix it via selectively enabling LINUX_KERNEL_IMAGE_HEADER where it's
actually required.

Fixes: 059d526af312 ("mach-snapdragon: generalise board support")
Reviewed-by: Caleb Connolly <caleb.connolly@linaro.org>
Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 69a7fa6..93e12d8 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1087,7 +1087,7 @@
 	select BOARD_LATE_INIT
 	select OF_BOARD
 	select SAVE_PREV_BL_FDT_ADDR
-	select LINUX_KERNEL_IMAGE_HEADER
+	select LINUX_KERNEL_IMAGE_HEADER if !ENABLE_ARM_SOC_BOOT0_HOOK
 	imply OF_UPSTREAM
 	imply CMD_DM