config: android-recommended: enable fstack-protector-strong

If compiler has stack protector support, set
CONFIG_CC_STACKPROTECTOR_STRONG.

Reviewed-at: https://android-review.googlesource.com/#/c/238388/Signed-off-by: Jeff Vander Stoep <jeffv@google.com>
[AmitP: cherry-picked this change from Android common kernel]
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

kernel/configs/android-recommended.config

@@ -11,6 +11,7 @@ CONFIG_BLK_DEV_DM=y
 CONFIG_BLK_DEV_LOOP=y
 CONFIG_BLK_DEV_RAM=y
 CONFIG_BLK_DEV_RAM_SIZE=8192
+CONFIG_CC_STACKPROTECTOR_STRONG=y
 CONFIG_COMPACTION=y
 CONFIG_STRICT_KERNEL_RWX=y
 CONFIG_DM_CRYPT=y