fall back to dm-crypt if device already encrypted

Devices already encrypted with aes-cbc-essiv:sha256 will continue to be
decrypted in software, until a factory data reset.  New devices that
implement CONFIG_HW_DISK_ENCRYPTION will switch to aes-xts.

b/17475056 Enable hardware crypto for userdata encryption

Change-Id: I62d1583bdaf7ff06b87e386e758fa3b18c719bca
Signed-off-by: Iliyan Malchev <malchev@google.com>
1 file changed