ath9k: ar5008_phy: Demote half completed function headers

Fixes the following W=1 kernel build warning(s):

 drivers/net/wireless/ath/ath9k/ar5008_phy.c:119: warning: Function parameter or member 'rfBuf' not described in 'ar5008_hw_phy_modify_rx_buffer'
 drivers/net/wireless/ath/ath9k/ar5008_phy.c:119: warning: Function parameter or member 'reg32' not described in 'ar5008_hw_phy_modify_rx_buffer'
 drivers/net/wireless/ath/ath9k/ar5008_phy.c:119: warning: Function parameter or member 'numBits' not described in 'ar5008_hw_phy_modify_rx_buffer'
 drivers/net/wireless/ath/ath9k/ar5008_phy.c:119: warning: Function parameter or member 'firstBit' not described in 'ar5008_hw_phy_modify_rx_buffer'

Cc: QCA ath9k Development <ath9k-devel@qca.qualcomm.com>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20201102112410.1049272-21-lee.jones@linaro.org

drivers/net/wireless/ath/ath9k/ar5008_phy.c

@@ -102,13 +102,8 @@ static void ar5008_write_bank6(struct ath_hw *ah, unsigned int *writecnt)
 	REGWRITE_BUFFER_FLUSH(ah);
 }
 
-/**
+/*
  * ar5008_hw_phy_modify_rx_buffer() - perform analog swizzling of parameters
- * @rfbuf:
- * @reg32:
- * @numBits:
- * @firstBit:
- * @column:
  *
  * Performs analog "swizzling" of parameters into their location.
  * Used on external AR2133/AR5133 radios.
@@ -198,10 +193,8 @@ static void ar5008_hw_force_bias(struct ath_hw *ah, u16 synth_freq)
 	ar5008_write_bank6(ah, &reg_writes);
 }
 
-/**
+/*
  * ar5008_hw_set_channel - tune to a channel on the external AR2133/AR5133 radios
- * @ah: atheros hardware structure
- * @chan:
  *
  * For the external AR2133/AR5133 radios, takes the MHz channel value and set
  * the channel value. Assumes writes enabled to analog bus and bank6 register
@@ -430,10 +423,8 @@ void ar5008_hw_cmn_spur_mitigate(struct ath_hw *ah,
 	REG_WRITE(ah, AR_PHY_MASK2_P_61_45, tmp_mask);
 }
 
-/**
+/*
  * ar5008_hw_spur_mitigate - convert baseband spur frequency for external radios
- * @ah: atheros hardware structure
- * @chan:
  *
  * For non single-chip solutions. Converts to baseband spur frequency given the
  * input channel frequency and compute register settings below.