Add label for /system/bin/fsck.exfat

Allow vold to run exFAT filesystem check.

Test: build, mount exFAT volume
Bug: 80202067
Change-Id: I68f3438de89246e806cebe483f37e31c68aaa3d7

private/file_contexts

@@ -192,6 +192,7 @@
 /system/bin/e2fsdroid		u:object_r:e2fs_exec:s0
 /system/bin/mke2fs		u:object_r:e2fs_exec:s0
 /system/bin/e2fsck	--	u:object_r:fsck_exec:s0
+/system/bin/fsck\.exfat	--	u:object_r:fsck_exec:s0
 /system/bin/fsck\.f2fs	--	u:object_r:fsck_exec:s0
 /system/bin/sload_f2fs	--	u:object_r:e2fs_exec:s0
 /system/bin/make_f2fs	--	u:object_r:e2fs_exec:s0