rpi34-linux-5.15.config: enable file locking for playready drm DST locking

Author: HaseenaSainul

board/raspberrypi/rpi34-linux-5.15.config

@@ -387,7 +387,8 @@ CONFIG_PWM=y
 CONFIG_PWM_BCM2835=y
 CONFIG_EXT4_FS=y
 CONFIG_EXT4_FS_POSIX_ACL=y
-# CONFIG_FILE_LOCKING is not set
+CONFIG_FILE_LOCKING=y
+CONFIG_MANDATORY_FILE_LOCKING=y
 CONFIG_MSDOS_FS=y
 CONFIG_VFAT_FS=y
 CONFIG_FAT_DEFAULT_IOCHARSET="ascii"