ext4: Add EXT4_IOC_FSGETXATTR/EXT4_IOC_FSSETXATTR to compat_ioctl

These are backed by 'struct fsxattr' which has the same size on all
architectures.
Signed-off-by: Martijn Coenen <maco@android.com>
Link: https://lore.kernel.org/r/20191227134639.35869-1-maco@android.comSigned-off-by: Theodore Ts'o <tytso@mit.edu>

fs/ext4/ioctl.c

@@ -1377,6 +1377,8 @@ long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 	case EXT4_IOC_CLEAR_ES_CACHE:
 	case EXT4_IOC_GETSTATE:
 	case EXT4_IOC_GET_ES_CACHE:
+	case EXT4_IOC_FSGETXATTR:
+	case EXT4_IOC_FSSETXATTR:
 		break;
 	default:
 		return -ENOIOCTLCMD;