[CRYPTO] Kconfig: Remove "default m"s

Other options requiring specific block cipher algorithms already have
the appropriate select's.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/Kconfig

@@ -146,7 +146,6 @@ config CRYPTO_ECB
 	tristate "ECB support"
 	select CRYPTO_BLKCIPHER
 	select CRYPTO_MANAGER
-	default m
 	help
 	  ECB: Electronic CodeBook mode
 	  This is the simplest block cipher algorithm.  It simply encrypts
@@ -156,7 +155,6 @@ config CRYPTO_CBC
 	tristate "CBC support"
 	select CRYPTO_BLKCIPHER
 	select CRYPTO_MANAGER
-	default m
 	help
 	  CBC: Cipher Block Chaining mode
 	  This block cipher algorithm is required for IPSec.
@@ -165,7 +163,6 @@ config CRYPTO_PCBC
 	tristate "PCBC support"
 	select CRYPTO_BLKCIPHER
 	select CRYPTO_MANAGER
-	default m
 	help
 	  PCBC: Propagating Cipher Block Chaining mode
 	  This block cipher algorithm is required for RxRPC.