staging: emxx_udc: remove unused variable driver_desc

When building with W=1 (or however you found it), there is a warning
that this variable is unused.

It is not used so remove it to fix the warning.

Signed-off-by: Sean Behan <codebam@riseup.net>
Link: https://lore.kernel.org/r/20210217142118.7107-1-codebam@riseup.net


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>