msm: Config option to enable idle stats device

MSM_SLEEP_STATS_DEVICE option is used to compile idle stats device
framework which is needed for GPU DCVS feature.

Change-Id: I9550c90054587aa4fcec40131761eeaf54da8a03
Signed-off-by: Lynus Vaz <lvaz@codeaurora.org>
diff --git a/drivers/gpu/msm/Makefile b/drivers/gpu/msm/Makefile
index 39a7b04..908b63d 100644
--- a/drivers/gpu/msm/Makefile
+++ b/drivers/gpu/msm/Makefile
@@ -14,7 +14,7 @@
 msm_kgsl_core-$(CONFIG_MSM_KGSL_CFF_DUMP) += kgsl_cffdump.o
 msm_kgsl_core-$(CONFIG_MSM_KGSL_DRM) += kgsl_drm.o
 msm_kgsl_core-$(CONFIG_MSM_SCM) += kgsl_pwrscale_trustzone.o
-msm_kgsl_core-$(CONFIG_MSM_SLEEP_STATS) += kgsl_pwrscale_idlestats.o
+msm_kgsl_core-$(CONFIG_MSM_SLEEP_STATS_DEVICE) += kgsl_pwrscale_idlestats.o
 
 msm_adreno-y += \
 	adreno_ringbuffer.o \