rt2x00: rt2800lib: use {tx,rx}_chain_num to avoid superfluous EEPROM access
The {rx,tx}_chain_num fields of rt2x00dev->default_ant contains the number of RX and TX chains already when the rt2800_probe_hw_mode() function runs. Use those values instead of parsing the EEPROM configuration values again. Signed-off-by: NGabor Juhos <juhosg@openwrt.org> Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
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