target/linux: add help text to kernel config

These options will be used for ksmbd. Once kernel 5.15
makes it in, this patch can go away.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

target/linux/generic/hack-5.10/253-ksmbd-config.patch

+--- a/init/Kconfig
++++ b/init/Kconfig
+@@ -2379,7 +2379,7 @@ config PADATA
+ 	bool
+ 
+ config ASN1
+-	tristate
++	tristate "ASN1"
+ 	help
+ 	  Build a simple ASN.1 grammar compiler that produces a bytecode output
+ 	  that can be interpreted by the ASN.1 stream decoder and used to
+--- a/lib/Kconfig
++++ b/lib/Kconfig
+@@ -590,7 +590,7 @@ config LIBFDT
+ 	bool
+ 
+ config OID_REGISTRY
+-	tristate
++	tristate "OID"
+ 	help
+ 	  Enable fast lookup object identifier registry.
+