ANDROID: dm table: propagate inline encryption flag to dm devices

If all targets in a device-mapper table support inline encryption, mark
the mapped device as supporting inline encryption.  This will allow
filesystems such as ext4 to tell whether the hardware supports inline
encryption even in the case where there is an intervening dm device.

Change-Id: I596829f6c5a39fb0d5bedfac9f18828ae27444cb
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Shivaprasad Hongal <shongal@codeaurora.org>