msm: kgsl: Remove last_expired_ctxt_id

last_expired_ctxt_id was used briefly for per context timestamps and now
can be removed as it is no longer used.

Change-Id: I51d3947fe6da366824d1b947ae3448bee3518477
Signed-off-by: Carter Cooper <ccooper@codeaurora.org>
diff --git a/drivers/gpu/msm/kgsl_device.h b/drivers/gpu/msm/kgsl_device.h
index 75b688b..0336a20 100644
--- a/drivers/gpu/msm/kgsl_device.h
+++ b/drivers/gpu/msm/kgsl_device.h
@@ -158,7 +158,6 @@
 	uint32_t state;
 	uint32_t requested_state;
 
-	unsigned int last_expired_ctxt_id;
 	unsigned int active_cnt;
 	struct completion suspend_gate;
 
@@ -216,8 +215,7 @@
 	.mutex = __MUTEX_INITIALIZER((_dev).mutex),\
 	.state = KGSL_STATE_INIT,\
 	.ver_major = DRIVER_VERSION_MAJOR,\
-	.ver_minor = DRIVER_VERSION_MINOR,\
-	.last_expired_ctxt_id = KGSL_CONTEXT_INVALID
+	.ver_minor = DRIVER_VERSION_MINOR
 
 struct kgsl_context {
 	struct kref refcount;