defconfig: turn on stack usage debugging on 8960

There have been reported crashes due to stack overflows on 8960. Log
messages indicating maximum stack usage will help detect this situation.

Change-Id: I0f090023845bcbbf6ddaab89b106d59a12804c90
Signed-off-by: Jeff Ohlstein <johlstei@codeaurora.org>
diff --git a/arch/arm/configs/msm8960_defconfig b/arch/arm/configs/msm8960_defconfig
index 3a70b22..130ed72 100644
--- a/arch/arm/configs/msm8960_defconfig
+++ b/arch/arm/configs/msm8960_defconfig
@@ -440,6 +440,7 @@
 CONFIG_DEBUG_SPINLOCK=y
 CONFIG_DEBUG_MUTEXES=y
 CONFIG_DEBUG_SPINLOCK_SLEEP=y
+CONFIG_DEBUG_STACK_USAGE=y
 CONFIG_DEBUG_INFO=y
 CONFIG_DEBUG_MEMORY_INIT=y
 CONFIG_DEBUG_LIST=y