[S390] zcrypt: add support for large random numbers

This patch allows user space applications to access large amounts of
truly random data. The random data source is the build-in hardware
random number generator on the CEX2C cards.

Signed-off-by: Ralph Wuerthner <rwuerthn@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>

drivers/crypto/Kconfig

@@ -64,6 +64,7 @@ config ZCRYPT
 	tristate "Support for PCI-attached cryptographic adapters"
 	depends on S390
 	select ZCRYPT_MONOLITHIC if ZCRYPT="y"
+	select HW_RANDOM
 	help
 	  Select this option if you want to use a PCI-attached cryptographic
 	  adapter like: