rtl8187: Remove unused variable rtl8225z2_tx_power_ofdm

Fix the following warning:

drivers/net/wireless/realtek/rtl818x/rtl8187/rtl8225.c:609:17: warning:
‘rtl8225z2_tx_power_ofdm’ defined but not used
 static const u8 rtl8225z2_tx_power_ofdm[] = {
Acked-by: Hin-Tak Leung <htl10@users.sourceforge.net>
Acked-by: Larry Finger <Larry.Finger@lwfinger.net>
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: ChenTao <chentao107@huawei.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200513011754.28432-1-chentao107@huawei.com

drivers/net/wireless/realtek/rtl818x/rtl8187/rtl8225.c

@@ -606,10 +606,6 @@ static const u8 rtl8225z2_tx_power_cck[] = {
 	0x26, 0x25, 0x21, 0x1b, 0x14, 0x0d, 0x06, 0x03
 };
 
-static const u8 rtl8225z2_tx_power_ofdm[] = {
-	0x42, 0x00, 0x40, 0x00, 0x40
-};
-
 static const u8 rtl8225z2_tx_gain_cck_ofdm[] = {
 	0x00, 0x01, 0x02, 0x03, 0x04, 0x05,
 	0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b,