RDMA/siw: Add missing Kconfig selections

The SoftiWARP Kconfig is missing "select" for CRYPTO and CRYPTO_CRC32C.

In addition, it improperly "depends on" LIBCRC32C, this should be a
"select", similar to net/sctp and others. As a dependency, SIW fails
to appear in generic configurations.

Link: https://lore.kernel.org/r/d366bf02-3271-754f-fc68-1a84016d0e19@talpey.comSigned-off-by: Tom Talpey <tom@talpey.com>
Acked-by: Bernard Metzler <bmt@zurich.ibm.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>

drivers/infiniband/sw/siw/Kconfig

 config RDMA_SIW
 	tristate "Software RDMA over TCP/IP (iWARP) driver"
-	depends on INET && INFINIBAND && LIBCRC32C
+	depends on INET && INFINIBAND
 	depends on INFINIBAND_VIRT_DMA
+	select LIBCRC32C
+	select CRYPTO
+	select CRYPTO_CRC32C
 	help
 	This driver implements the iWARP RDMA transport over
 	the Linux TCP/IP network stack. It enables a system with a