Add sysfs_extcon for /sys/class/extcon

Bug: 124364409
Change-Id: Idc33732454674bbdc7f4ff6eda173acc24e318b3
Test: cherry picked to pi-tv-dr-dev and tested on JBL Link bar
diff --git a/private/genfs_contexts b/private/genfs_contexts
index 9d58f0a..11edf66 100644
--- a/private/genfs_contexts
+++ b/private/genfs_contexts
@@ -100,6 +100,7 @@
 genfscon sysfs / u:object_r:sysfs:s0
 genfscon sysfs /devices/system/cpu u:object_r:sysfs_devices_system_cpu:s0
 genfscon sysfs /class/android_usb                 u:object_r:sysfs_android_usb:s0
+genfscon sysfs /class/extcon                      u:object_r:sysfs_extcon:s0
 genfscon sysfs /class/leds                        u:object_r:sysfs_leds:s0
 genfscon sysfs /class/net                         u:object_r:sysfs_net:s0
 genfscon sysfs /class/rfkill/rfkill0/state        u:object_r:sysfs_bluetooth_writable:s0