defconfig: disable perflock

Change-Id: I2dc98a36cee8f04014e04b7ddd1cce11ce6715ae
diff --git a/arch/arm/configs/cm_m8_defconfig b/arch/arm/configs/cm_m8_defconfig
index e336332..05e2caa 100644
--- a/arch/arm/configs/cm_m8_defconfig
+++ b/arch/arm/configs/cm_m8_defconfig
@@ -539,7 +539,7 @@
 # CONFIG_MACH_M8_WHL is not set
 # CONFIG_MACH_M8_WL is not set
 CONFIG_MACH_NAME=""
-CONFIG_PERFLOCK=y
+# CONFIG_PERFLOCK is not set
 
 #
 # System MMU