ARM: exynos_defconfig: Enable locking test options

exynos_defconfig, beside serving as a reference config for Exynos-based
devices, is used by developers during regular development work.
Enabling options responsible for locking tests allows to discover bugs
in drivers and mach code earlier.

This enables:
1. Detection of sleeping in atomic sections (DEBUG_ATOMIC_SLEEP),
2. Full lockdep (DEBUG_LOCK_ALLOC and PROVE_LOCKING which makes other
   lock debug entries unneeded),
3. Detection of soft, kernel lockups (SOFTLOCKUP_DETECTOR).
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Anand Moon <linux.amoon@gmail.com>

arch/arm/configs/exynos_defconfig

@@ -3,7 +3,6 @@ CONFIG_NO_HZ=y
 CONFIG_HIGH_RES_TIMERS=y
 CONFIG_CGROUPS=y
 CONFIG_BLK_DEV_INITRD=y
-CONFIG_KALLSYMS_ALL=y
 CONFIG_MODULES=y
 CONFIG_MODULE_UNLOAD=y
 CONFIG_PARTITION_ADVANCED=y
@@ -315,10 +314,10 @@ CONFIG_DEBUG_INFO=y
 CONFIG_DEBUG_FS=y
 CONFIG_MAGIC_SYSRQ=y
 CONFIG_DEBUG_KERNEL=y
-CONFIG_LOCKUP_DETECTOR=y
-CONFIG_DEBUG_RT_MUTEXES=y
-CONFIG_DEBUG_SPINLOCK=y
-CONFIG_DEBUG_MUTEXES=y
+CONFIG_SOFTLOCKUP_DETECTOR=y
+# CONFIG_DETECT_HUNG_TASK is not set
+CONFIG_PROVE_LOCKING=y
+CONFIG_DEBUG_ATOMIC_SLEEP=y
 CONFIG_DEBUG_USER=y
 CONFIG_CRYPTO_RSA=m
 CONFIG_CRYPTO_DH=m