drivers: video: hdmi: cleanup coding style in video a bit

Eliminate the magic numbers, add vendor infoframe size macro
like other hdmi modules.
Signed-off-by: Bernard Zhao <bernard@vivo.com>
Cc: Uma Shankar <uma.shankar@intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Shashank Sharma <shashank.sharma@intel.com>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: opensource.kernel@vivo.com
[b.zolnierkie: add "hdmi" to the patch summary]
[b.zolnierkie: fix "vender" -> vendor" typo in the patch description]
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200427080530.3234-1-bernard@vivo.com

drivers/video/hdmi.c

@@ -495,7 +495,7 @@ int hdmi_vendor_infoframe_init(struct hdmi_vendor_infoframe *frame)
 	 * value
 	 */
 	frame->s3d_struct = HDMI_3D_STRUCTURE_INVALID;
-	frame->length = 4;
+	frame->length = HDMI_VENDOR_INFOFRAME_SIZE;
 
 	return 0;
 }

include/linux/hdmi.h

@@ -57,6 +57,7 @@ enum hdmi_infoframe_type {
 #define HDMI_SPD_INFOFRAME_SIZE    25
 #define HDMI_AUDIO_INFOFRAME_SIZE  10
 #define HDMI_DRM_INFOFRAME_SIZE    26
+#define HDMI_VENDOR_INFOFRAME_SIZE  4
 
 #define HDMI_INFOFRAME_SIZE(type)	\
 	(HDMI_INFOFRAME_HEADER_SIZE + HDMI_ ## type ## _INFOFRAME_SIZE)