crypto: caam - fix input job ring element dma mapping size

SEC4 h/w gets configured in 32- vs. 36-bit physical
addressing modes depending on the size of dma_addr_t,
which is not always equal to sizeof(u32 *).

Also fixed alignment of a dma_unmap call whilst in there.

Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>