ext4: allow move extents ioctl for HW FBE

The limitation of EXT4_IOC_MOVE_EXT ioctl for handling encrypted
files is only applicable for SW FBE but not for HW FBE. Hence,
enable this ioctl for HW FBE so that tools such as e4defrag can
make use of it on such devices.

Change-Id: I4bd08185a14b03cb9bcda49d1955d0c95701515c
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>