extcon: Add new EXTCON_DISP_HMD for Head-mounted Display device

This patch adds the new EXTCON_DISP_HMD id for Head-mounted Display[1] device.
The HMD device is usually for USB connector type So, the HMD connector
has the two extcon types of both EXTCON_TYPE_DISP and EXTCON_TYPE_USB.

[1] https://en.wikipedia.org/wiki/Head-mounted_displaySigned-off-by: Chanwoo Choi <cw00.choi@samsung.com>

drivers/extcon/extcon.c

@@ -162,6 +162,11 @@ struct __extcon_info {
 		.id = EXTCON_DISP_DP,
 		.name = "DP",
 	},
+	[EXTCON_DISP_HMD] = {
+		.type = EXTCON_TYPE_DISP | EXTCON_TYPE_USB,
+		.id = EXTCON_DISP_HMD,
+		.name = "HMD",
+	},
 
 	/* Miscellaneous external connector */
 	[EXTCON_DOCK] = {

include/linux/extcon.h

@@ -70,6 +70,7 @@
 #define EXTCON_DISP_DVI		42	/* Digital Visual Interface */
 #define EXTCON_DISP_VGA		43	/* Video Graphics Array */
 #define EXTCON_DISP_DP		44	/* Display Port */
+#define EXTCON_DISP_HMD		45	/* Head-Mounted Display */
 
 /* Miscellaneous external connector */
 #define EXTCON_DOCK		60