crypto/octeontx2: extend AES-GCM capabilities

OCTEON TX2 crypto PMD supports digest lengths from 4 to 16 bytes
with new firmware.

Signed-off-by: Archana Muniganti <marchana@marvell.com>
Signed-off-by: Anoob Joseph <anoobj@marvell.com>

drivers/crypto/octeontx2/otx2_cryptodev_capabilities.c

@@ -577,9 +577,9 @@ rte_cryptodev_capabilities otx2_cpt_capabilities[] = {
 					.increment = 8
 				},
 				.digest_size = {
-					.min = 8,
+					.min = 4,
 					.max = 16,
-					.increment = 4
+					.increment = 1
 				},
 				.aad_size = {
 					.min = 0,