ath5k: Choose the right initvals for RF2425

* Fix a typo in initvals.c so that we use the RF2425 array for RF2425 and not RF2413

Note: This also fixes incorect pd gain overlap since RF2425 has different pd gain overlap from RF2413

Signed-off-by: Nick Kossifidis <mickflemm@gmail.com>
Acked-by: Bob Copeland <me@bobcopeland.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>