crypto: Add wait states for hash/hmac operations

Currently, hash (SHA1/256/hmac) operation occasionally results
in an incorrect hash value. This is due to the premature reading
of the AUTH_IV register done before the last SHA block is processed.
There needs to be enough delay (wait states) before the AUTH_IV
register is read to extract the hash value.

The current implementation has 2 wait states. Adding 2 more wait states
for hash operations, resolves the issue.

The wait states are calculated based on the inputs from the hardware
team with regards to the time taken to process the last block of 16
bytes of the data packet.

Change-Id: I4f9e784fbfca62d6636d87dc44c1bf9992e3b3e4
Signed-off-by: Mona Hossain <mhossain@codeaurora.org>