package/cryptodev: convert to the virtual-package infrastructure

Since this package is implemented via a choice rather than the usual
separate-package providers, we only need BR2_PACKAGE_HAS_CRYPTODEV
to be always defined when the 'cryptodev' package is selected.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Eric Le Bihan <eric.le.bihan.dev@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Thomas De Schampheleire <patrickdepinguin@gmail.com>
Cc: Mike Zick <minimod@morethan.org>
Reviewed-by: Samuel Martin <s.martin49@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/cryptodev/Config.in

@@ -37,6 +37,9 @@ config BR2_PACKAGE_OCF_LINUX
 
 endchoice
 
+config BR2_PACKAGE_HAS_CRYPTODEV
+	def_bool y
+
 config BR2_PACKAGE_PROVIDES_CRYPTODEV
 	string
 	default "cryptodev-linux" if BR2_PACKAGE_CRYPTODEV_LINUX

package/cryptodev/cryptodev.mk

@@ -4,14 +4,4 @@
 #
 ################################################################################
 
-CRYPTODEV_SOURCE =
-CRYPTODEV_DEPENDENCIES = $(call qstrip,$(BR2_PACKAGE_PROVIDES_CRYPTODEV))
-
-ifeq ($(CRYPTODEV_DEPENDENCIES),)
-define CRYPTODEV_CONFIGURE_CMDS
-	echo "No CRYPTODEV implementation defined. Configuration error"
-	exit 1
-endef
-endif
-
-$(eval $(generic-package))
+$(eval $(virtual-package))