mk_mmc.sh: cleanup: drm_device_identifier

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>

hwpack/tegra124-jetson-tk1.conf

@@ -50,5 +50,5 @@ SERIAL_CONSOLE="${SERIAL},115200n8"
 
 di_serial_mode=enable
 
-conf_note="Required: https://github.com/NVIDIA/tegra-uboot-flasher-scripts."
+conf_note="Required: https://github.com/NVIDIA/tegra-uboot-flasher-scripts"
 #

mk_mmc.sh

@@ -284,7 +284,8 @@ boot_uenv_txt_template () {
 		__EOF__
 	fi
 
-	if [ "${drm_device_identifier}" ] ; then
+	drm_device_identifier=${drm_device_identifier:-"HDMI-A-1"}
+
 	cat >> ${TEMPDIR}/bootscripts/normal.cmd <<-__EOF__
 		##Video: [ls /sys/class/drm/]
 		##Docs: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/fb/modedb.txt
@@ -300,23 +301,6 @@ boot_uenv_txt_template () {
 		#kms_force_mode=video=${drm_device_identifier}:1024x768@60e
 
 	__EOF__
-	else
-		cat >> ${TEMPDIR}/bootscripts/normal.cmd <<-__EOF__
-			##Video: [ls /sys/class/drm/]
-			##Docs: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/fb/modedb.txt
-			##Uncomment to override:
-			#kms_force_mode=video=HDMI-A-1:1024x768@60e
-
-		__EOF__
-
-		cat >> ${TEMPDIR}/bootscripts/netinstall.cmd <<-__EOF__
-			##Video: [ls /sys/class/drm/]
-			##Docs: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/fb/modedb.txt
-			##Uncomment to override:
-			#kms_force_mode=video=HDMI-A-1:1024x768@60e
-
-		__EOF__
-	fi
 
 	if [ "x${drm_read_edid_broken}" = "xenable" ] ; then
 		sed -i -e 's:#kms_force_mode:kms_force_mode:g' ${TEMPDIR}/bootscripts/normal.cmd