crypto: fix build with icc

crypto: fix build with icc

This commit fixes a compilation error on icc,
due to unallowed conversion from int to enum:

drivers/crypto/snow3g/rte_snow3g_pmd.c(155):
    error #188: enumerated type mixed with another type
        sess->op = mode;
                 ^
drivers/crypto/kasumi/rte_kasumi_pmd.c(155):
    error #188: enumerated type mixed with another type
        sess->op = mode;
                 ^

Fixes: 3aafc423cf4d ("snow3g: add driver for SNOW 3G library")
Fixes: 2773c86d061a ("crypto/kasumi: add driver for KASUMI library")

Signed-off-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
Acked-by: Ferruh Yigit <ferruh.yigit@intel.com>