crypto: geniv - Split geniv out of AEAD Kconfig option

Give geniv its own Kconfig option so that its dependencies are
distinct from that of the AEAD API code.  This also allows it
to be disabled if no IV generators (seqiv/echainiv) are enabled.

Remove the obsolete select on RNG2 by SKCIPHER2 as skcipher IV
generators disappeared long ago.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/Kconfig

@@ -71,8 +71,6 @@ config CRYPTO_AEAD
 config CRYPTO_AEAD2
 	tristate
 	select CRYPTO_ALGAPI2
-	select CRYPTO_NULL2
-	select CRYPTO_RNG2
 
 config CRYPTO_SKCIPHER
 	tristate
@@ -82,7 +80,6 @@ config CRYPTO_SKCIPHER
 config CRYPTO_SKCIPHER2
 	tristate
 	select CRYPTO_ALGAPI2
-	select CRYPTO_RNG2
 
 config CRYPTO_HASH
 	tristate
@@ -834,13 +831,16 @@ config CRYPTO_GCM
 
 	  This is required for IPSec ESP (XFRM_ESP).
 
-config CRYPTO_SEQIV
-	tristate "Sequence Number IV Generator"
+config CRYPTO_GENIV
+	tristate
 	select CRYPTO_AEAD
-	select CRYPTO_SKCIPHER
 	select CRYPTO_NULL
-	select CRYPTO_RNG_DEFAULT
 	select CRYPTO_MANAGER
+	select CRYPTO_RNG_DEFAULT
+
+config CRYPTO_SEQIV
+	tristate "Sequence Number IV Generator"
+	select CRYPTO_GENIV
 	help
 	  Sequence Number IV generator
 
@@ -851,10 +851,7 @@ config CRYPTO_SEQIV
 
 config CRYPTO_ECHAINIV
 	tristate "Encrypted Chain IV Generator"
-	select CRYPTO_AEAD
-	select CRYPTO_NULL
-	select CRYPTO_RNG_DEFAULT
-	select CRYPTO_MANAGER
+	select CRYPTO_GENIV
 	help
 	  Encrypted Chain IV generator
 

crypto/Makefile

@@ -14,7 +14,7 @@ crypto_algapi-y := algapi.o scatterwalk.o $(crypto_algapi-y)
 obj-$(CONFIG_CRYPTO_ALGAPI2) += crypto_algapi.o
 
 obj-$(CONFIG_CRYPTO_AEAD2) += aead.o
-obj-$(CONFIG_CRYPTO_AEAD2) += geniv.o
+obj-$(CONFIG_CRYPTO_GENIV) += geniv.o
 
 obj-$(CONFIG_CRYPTO_SKCIPHER2) += skcipher.o
 obj-$(CONFIG_CRYPTO_SEQIV) += seqiv.o