crypto: Remove MPILIB_EXTRA

The symbol is an orphan, get rid of it.
Signed-off-by: NRichard Weinberger <richard@nod.at>
Signed-off-by: NPaul Bolle <pebolle@tiscali.nl>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

crypto/asymmetric_keys/Kconfig

@@ -22,7 +22,6 @@ config ASYMMETRIC_PUBLIC_KEY_SUBTYPE
 
 config PUBLIC_KEY_ALGO_RSA
 	tristate "RSA public-key algorithm"
-	select MPILIB_EXTRA
 	select MPILIB
 	help
 	  This option enables support for the RSA algorithm (PKCS#1, RFC3447).