Input: e3x0-button - update Kconfig description
Input: e3x0-button - update Kconfig description

The driver is now used for the entire USRP e3xx series,
this commit fixes the description that will be displayed in
the menu accordingly.

Signed-off-by: Moritz Fischer <16c4312f096cb05ec900643fe7a5f22f7761ab4a@ettus.com>
Signed-off-by: Dmitry Torokhov <6b8646d310837fed93a129ed3c979b90c7f2674f@gmail.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs