rtl8xxxu: Set REG_USB_HRPWM for 8192eu

The vendor driver set register 0xfe58 REG_USB_HWPWM in it's init
sequence for 8192eu. Do the same here.
Signed-off-by: NJes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: NKalle Valo <kvalo@codeaurora.org>

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

@@ -7225,6 +7225,8 @@ static int rtl8xxxu_init_device(struct ieee80211_hw *hw)
 			val32 |= FPGA_RF_MODE_CCK;
 			rtl8xxxu_write32(priv, REG_FPGA0_RF_MODE, val32);
 		}
+	} else if (priv->rtl_chip == RTL8192E) {
+		rtl8xxxu_write8(priv, REG_USB_HRPWM, 0x00);
 	}
 
 	val32 = rtl8xxxu_read32(priv, REG_FWHW_TXQ_CTRL);

drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_regs.h

@@ -1043,6 +1043,7 @@
 #define  USB_HIMR_ROK			BIT(0)	/*  Receive DMA OK Interrupt */
 
 #define REG_USB_SPECIAL_OPTION		0xfe55
+#define REG_USB_HRPWM			0xfe58
 #define REG_USB_DMA_AGG_TO		0xfe5b
 #define REG_USB_AGG_TO			0xfe5c
 #define REG_USB_AGG_TH			0xfe5d