CC312: Hash chunking implemented

CC312 has a limitation that the maximum size of a data block to be
hashed is 0xFFFF. To overcome this limitation the hash of big input
buffers is calculated with more calls to CC312, passing only a smaller
part of the input at a time.

Signed-off-by: Mark Horvath <mark.horvath@arm.com>
Change-Id: Idb7a0c997bbe66b57d63f5d646cf6fdabd2ee179