wifi: rt2x00: define RF5592 in init_eeprom routine

Fix incorrect RF value encoded in EEPROM on devices with Ralink Rt5592
PCIe radio (a single chip 2T2R 802.11abgn solution).

Signed-off-by: Tomislav Požega <pozega.tomislav@gmail.com>
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Acked-by: Stanislaw Gruszka <stf_xl@wp.pl>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/d7eccb2c7b8ec4cd360fa2007796abffc35abb0d.1663445157.git.daniel@makrotopia.org