msm: kgsl: Abstract out the GPMU perfcounter registers

The GPMU power perfcounters used the A5XX offsets in common code.
Use the appropriate register offsets instead of A5XX offsets.

Change-Id: I417c6014aa768146dd4131f261b13398642bd407
Signed-off-by: Lynus Vaz <lvaz@codeaurora.org>
diff --git a/drivers/gpu/msm/adreno.h b/drivers/gpu/msm/adreno.h
index 26c5505..7a6581c 100644
--- a/drivers/gpu/msm/adreno.h
+++ b/drivers/gpu/msm/adreno.h
@@ -641,6 +641,7 @@
 	ADRENO_REG_GMU_HOST2GMU_INTR_SET,
 	ADRENO_REG_GMU_HOST2GMU_INTR_CLR,
 	ADRENO_REG_GMU_HOST2GMU_INTR_RAW_INFO,
+	ADRENO_REG_GPMU_POWER_COUNTER_ENABLE,
 	ADRENO_REG_REGISTER_MAX,
 };