imsm: drive encryption policy implementation

imsm: drive encryption policy implementation

IMSM cares about drive encryption state. It is not allowed to mix disks
with different encryption state within one md device. This policy will
verify that attempt to use disks with different encryption states will
fail. Verification is performed for devices NVMe/SATA Opal and SATA.

There is one exception, Opal SATA drives encryption is not checked when
ENCRYPTION_NO_VERIFY key with "sata_opal" value is set in conf, for this
reason such drives are treated as without encryption support.

Signed-off-by: Blazej Kucman <blazej.kucman@intel.com>
Signed-off-by: Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com>