wifi: rtl8xxxu: Fix assignment to bit field priv->pi_enabled

Just because priv->pi_enabled is only one bit doesn't mean it works
like a bool. The value assigned to it loses all bits except bit 0,
so only assign 0 or 1 to it.

This affects the RTL8188FU, but fixing the assignment didn't make
a difference for my device.

Fixes: c888183b ("wifi: rtl8xxxu: Support new chip RTL8188FU")
Signed-off-by: Bitterblue Smith <rtl8821cerfe2@gmail.com>
Reviewed-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/4368d585-11ec-d3c7-ec12-7f0afdcedfda@gmail.com

drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c

@@ -1122,7 +1122,7 @@ static void rtl8188fu_phy_iqcalibrate(struct rtl8xxxu_priv *priv,
 
 	if (t == 0) {
 		val32 = rtl8xxxu_read32(priv, REG_FPGA0_XA_HSSI_PARM1);
-		priv->pi_enabled = val32 & FPGA0_HSSI_PARM1_PI;
+		priv->pi_enabled = u32_get_bits(val32, FPGA0_HSSI_PARM1_PI);
 	}
 
 	/* save RF path */