CHROMIUM: ARM64: dragon: Enable CONFIG_SECTION_MISMATCH_FATAL

BUG=chromium:534254
TEST=cros_workon-smaug start chromeos-kernel-3_18
     emerge-smaug chromeos-kernel-3_18: no warning, no errors.

Signed-off-by: Nicolas Boichat <drinkcat@chromium.org>

Change-Id: Ia11e66c46bea8db61350c1548684b7c2d3eaef9d
Reviewed-on: https://chromium-review.googlesource.com/303122
Commit-Ready: Nicolas Boichat <drinkcat@chromium.org>
Tested-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-by: Olof Johansson <olofj@chromium.org>

arch/arm64/configs/dragon_defconfig

@@ -535,6 +535,7 @@ CONFIG_NLS_ASCII=y
 CONFIG_NLS_ISO8859_1=y
 CONFIG_PRINTK_TIME=y
 CONFIG_DEBUG_INFO=y
+CONFIG_SECTION_MISMATCH_FATAL=y
 CONFIG_MAGIC_SYSRQ=y
 CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE=0
 CONFIG_LOCKUP_DETECTOR=y