drm/omap: Use consistent name for struct videomode

Use 'vm' to refer to a struct videomode instead of 'p', 't', 'timings' or
something else.

The code will be easier to follow if we use consistent names.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
diff --git a/drivers/gpu/drm/omapdrm/dss/dss.h b/drivers/gpu/drm/omapdrm/dss/dss.h
index 3842675..56493b2 100644
--- a/drivers/gpu/drm/omapdrm/dss/dss.h
+++ b/drivers/gpu/drm/omapdrm/dss/dss.h
@@ -366,8 +366,7 @@ bool dispc_div_calc(unsigned long dispc,
 		unsigned long pck_min, unsigned long pck_max,
 		dispc_div_calc_func func, void *data);
 
-bool dispc_mgr_timings_ok(enum omap_channel channel,
-		const struct videomode *timings);
+bool dispc_mgr_timings_ok(enum omap_channel channel, const struct videomode *vm);
 int dispc_calc_clock_rates(unsigned long dispc_fclk_rate,
 		struct dispc_clock_info *cinfo);
 
@@ -390,7 +389,7 @@ void dispc_wb_enable(bool enable);
 bool dispc_wb_is_enabled(void);
 void dispc_wb_set_channel_in(enum dss_writeback_channel channel);
 int dispc_wb_setup(const struct omap_dss_writeback_info *wi,
-		bool mem_to_mem, const struct videomode *timings);
+		bool mem_to_mem, const struct videomode *vm);
 
 /* VENC */
 int venc_init_platform_driver(void) __init;