net/ieee802154: remove depends on CONFIG_EXPERIMENTAL

The CONFIG_EXPERIMENTAL config item has not carried much meaning for a
while now and is almost always enabled by default. As agreed during the
Linux kernel summit, remove it from any "depends on" lines in Kconfigs.

CC: Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
CC: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
CC: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: David S. Miller <davem@davemloft.net>

net/ieee802154/Kconfig

 config IEEE802154
-	tristate "IEEE Std 802.15.4 Low-Rate Wireless Personal Area Networks support (EXPERIMENTAL)"
-	depends on EXPERIMENTAL
+	tristate "IEEE Std 802.15.4 Low-Rate Wireless Personal Area Networks support"
 	---help---
 	  IEEE Std 802.15.4 defines a low data rate, low power and low
 	  complexity short range wireless personal area networks. It was