ENGR00215492-3: Detect HW features during alg registration

ENGR00215492-3: Detect HW features during alg registration

i.MX6 instantiates a CAAM with a low-power MDHA block, which does not
compute digests larger than 256 bits. Since the driver installs handlers
for hashes longer than 256 bits in several places, added the ability to
read and interpret the CHA version and instantiations registers, and then
only register handlers that it can support.

Signed-off-by: Steve Cornelius <steve.cornelius@freescale.com>
Signed-off-by: Terry Lv <r65388@freescale.com>