kernel: Make LIB_ARC4 selectable

This makes it possible to select CONFIG_CRYPTO_LIB_ARC4 directly. We
need this to be able to compile this into the kernel and make use of it
from mac80211 backports.

Signed-off-by: Hauke Mehrtens <[email protected]>

target/linux/generic/hack-5.4/260-lib-arc4-unhide.patch

@@ -0,0 +1,15 @@
+This makes it possible to select CONFIG_CRYPTO_LIB_ARC4 directly. We 
+need this to be able to compile this into the kernel and make use of it 
+from backports.
+
+--- a/crypto/Kconfig
++++ b/crypto/Kconfig
+@@ -1151,7 +1151,7 @@ config CRYPTO_ANUBIS
+ 	  <http://www.larc.usp.br/~pbarreto/AnubisPage.html>
+ 
+ config CRYPTO_LIB_ARC4
+-	tristate
++	tristate "ARC4 cipher library"
+ 
+ config CRYPTO_ARC4
+ 	tristate "ARC4 cipher algorithm"