integrity: Select CRYPTO from INTEGRITY_ASYMMETRIC_KEYS

Select CRYPTO from INTEGRITY_ASYMMETRIC_KEYS, since
INTEGRITY_ASYMMETRIC_KEYS selects several options that depend on CRYPTO.

This unblocks the removal of the CRYPTO selection from SIGNATURE.
SIGNATURE (lib/digsig.c) itself will no longer need CRYPTO, but
INTEGRITY_ASYMMETRIC_KEYS was depending on it indirectly via the chain
SIGNATURE => INTEGRITY_SIGNATURE => INTEGRITY_ASYMMETRIC_KEYS.

Signed-off-by: Eric Biggers <[email protected]>
Reviewed-by: Paul Menzel <[email protected]>
Signed-off-by: Mimi Zohar <[email protected]>

Author: Eric Biggers

security/integrity/Kconfig

@@ -36,6 +36,7 @@ config INTEGRITY_ASYMMETRIC_KEYS
 	default n
 	select ASYMMETRIC_KEY_TYPE
 	select ASYMMETRIC_PUBLIC_KEY_SUBTYPE
+	select CRYPTO
 	select CRYPTO_RSA
 	select X509_CERTIFICATE_PARSER
 	help