m68k/defconfig: Enable automounting of devtmpfs at /dev

Enable CONFIG_DEVTMPFS_MOUNT, as it's useful for initrd-less kernels.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
diff --git a/arch/m68k/configs/sun3_defconfig b/arch/m68k/configs/sun3_defconfig
index 014672a..cfe2f26 100644
--- a/arch/m68k/configs/sun3_defconfig
+++ b/arch/m68k/configs/sun3_defconfig
@@ -237,6 +237,7 @@
 # CONFIG_WIRELESS is not set
 # CONFIG_UEVENT_HELPER is not set
 CONFIG_DEVTMPFS=y
+CONFIG_DEVTMPFS_MOUNT=y
 # CONFIG_FIRMWARE_IN_KERNEL is not set
 CONFIG_CONNECTOR=m
 CONFIG_BLK_DEV_LOOP=y