drm/imx: consolidate bus format variable names

This patch consolidates the different interface_pix_fmt, pixel_fmt, pix_fmt,
and pixfmt variables to a common name "bus_format" wherever they describe the
pixel format on the bus between display controller and encoder hardware.
At the same time, it renames imx_drm_panel_format to imx_drm_set_bus_format.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Tested-by: Emil Renner Berthing <kernel@esmil.dk>
diff --git a/drivers/gpu/drm/imx/imx-tve.c b/drivers/gpu/drm/imx/imx-tve.c
index bcdcb1b..214ecee 100644
--- a/drivers/gpu/drm/imx/imx-tve.c
+++ b/drivers/gpu/drm/imx/imx-tve.c
@@ -301,11 +301,11 @@
 
 	switch (tve->mode) {
 	case TVE_MODE_VGA:
-		imx_drm_panel_format_pins(encoder, MEDIA_BUS_FMT_YUV8_1X24,
-				tve->hsync_pin, tve->vsync_pin);
+		imx_drm_set_bus_format_pins(encoder, MEDIA_BUS_FMT_YUV8_1X24,
+					    tve->hsync_pin, tve->vsync_pin);
 		break;
 	case TVE_MODE_TVOUT:
-		imx_drm_panel_format(encoder, MEDIA_BUS_FMT_YUV8_1X24);
+		imx_drm_set_bus_format(encoder, MEDIA_BUS_FMT_YUV8_1X24);
 		break;
 	}
 }