disp: msm: dsi: add widebus support for DSI

From Lahaina onwards, for compressed DSI output, widebus should be enabled.
In widebus mode, 6 bytes of data are transmitted per pclk.
For uncompressed output, widebus must be disabled to transmit 3 bytes
of uncompressed data per pclk.

Change-Id: I7fc0bdb2e1678152d57b4cbb8295063a2ba8ae73
Signed-off-by: Rajkumar Subbiah <rsubbia@codeaurora.org>

msm/msm_drv.h

@@ -290,6 +290,16 @@ enum panel_op_mode {
 	MSM_DISPLAY_MODE_MAX,
 };
 
+/**
+ * struct msm_ratio - integer ratio
+ * @numer: numerator
+ * @denom: denominator
+ */
+struct msm_ratio {
+	uint32_t numer;
+	uint32_t denom;
+};
+
 /**
  * enum msm_event_wait - type of HW events to wait for
  * @MSM_ENC_COMMIT_DONE - wait for the driver to flush the registers to HW