msm: kgsl: Avoid excessive logging from KGSL

During adreno_start(), KGSL prints a log if it
cannot get the DCVS counters. Change to WARN_ONCE
to avoid excessive logging.

CRs-Fixed: 2017390
Change-Id: I7f0b1b31dae941a430895cfa71d221ee990cea72
Signed-off-by: Kyle Piefer <kpiefer@codeaurora.org>
diff --git a/drivers/gpu/msm/adreno.c b/drivers/gpu/msm/adreno.c
index bf3a91a..2e92335 100644
--- a/drivers/gpu/msm/adreno.c
+++ b/drivers/gpu/msm/adreno.c
@@ -1509,8 +1509,7 @@
 			PERFCOUNTER_FLAG_KERNEL);
 
 		if (ret) {
-			KGSL_DRV_ERR(device,
-				"Unable to get the perf counters for DCVS\n");
+			WARN_ONCE(1, "Unable to get perf counters for DCVS\n");
 			adreno_dev->perfctr_pwr_lo = 0;
 		}
 	}