coresight: use fixed clock rate for tpiu sdc use case

Vote for a fixed clock frequency for TPIU output to SD to
workaround trace data corruption issues across XO shutdown.

Change-Id: Iaa7e822899685c3b5d0cc01dea1090e817e9b129
Signed-off-by: Pratik Patel <pratikp@codeaurora.org>
diff --git a/include/linux/coresight.h b/include/linux/coresight.h
index 5b69884..fbd5fb0 100644
--- a/include/linux/coresight.h
+++ b/include/linux/coresight.h
@@ -41,6 +41,7 @@
 	CORESIGHT_CLK_RATE_OFF,
 	CORESIGHT_CLK_RATE_TRACE = 1000,
 	CORESIGHT_CLK_RATE_HSTRACE = 2000,
+	CORESIGHT_CLK_RATE_FIXED = 3000,
 };
 
 enum coresight_dev_type {