crypto/cnxk: use struct sizes for CTX writes
crypto/cnxk: use struct sizes for CTX writes

CTX writes only require the lengths are 8B aligned. Use the struct size
directly.

Signed-off-by: Anoob Joseph <3ccb4777bd2856f4d9127f25efe6455b1a791ba2@marvell.com>
Acked-by: Akhil Goyal <c3c9da6f7a1dc963875aa67cfd85a4c94f75d526@marvell.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk