Kconfig: Enable CONFIG_WERROR

Building kernel code should not trigger any compiler warnings. Hence
enable CONFIG_WERROR.

Tested: Built
Fusion-Link: fusion2 N/A
Google-Bug-Id: 558753346
Change-Id: Iea06f4f94f81b3c2dfd40104fd1d0179b286f2b0
Signed-off-by: Bart Van Assche <bvanassche@google.com>

recipes-kernel/linux/files/gbmc_defconfig

diff --git a/recipes-kernel/linux/files/gbmc_defconfig b/recipes-kernel/linux/files/gbmc_defconfig
index d47f327..d485e92 100644
--- a/recipes-kernel/linux/files/gbmc_defconfig
+++ b/recipes-kernel/linux/files/gbmc_defconfig
@@ -77,6 +77,7 @@
 CONFIG_MODULES=y
 CONFIG_MODULE_FORCE_LOAD=y
 CONFIG_MODULE_UNLOAD=y
+CONFIG_WERROR=y >=6.18-rc0
 # for platforms using out of tree module this should not be set
 # otherwise we should enable this
 CONFIG_TRIM_UNUSED_KSYMS=y ~ootmod