dts: msm8226: mss8926-v2-720p-mtp: clarify how to pick the panel

Sony Xperia M2 (Aqua) now has two panels to choose from. Clarify in the
comment how to pick the right one for your device.

Signed-off-by: Erikas Bitovtas <xerikasxx@gmail.com>

Author: erikas9987

lk2nd/device/dts/msm8226/msm8926-v2-720p-mtp.dts

@@ -29,9 +29,15 @@
 
 	sony-eagle {
 		/*
-		 * To build for sony-eagle, add the following flag in your make cmdline:
+		 * To build for sony-eagle, boot the downstream kernel and run the following
+		 * command in adb shell:
 		 *
-		 * make ... LK2ND_DISPLAY="innolux_qhd_video"
+		 * dmesg | grep LCD_ID
+		 *
+		 * Then pass appropriate LK2ND display based on LCD_ID value:
+		 * make ... LK2ND_DISPLAY="innolux_qhd_video" (LCD_ID=0)
+		 *			   or
+		 *			   "truly_qhd_video" (LCD_ID=1)
 		 *
 		 * `LK2ND_DISPLAY` selects the appropriate display driver. This is required
 		 * because the screen initialization needs specific configuration.