mwifiex: add missing check for PCIe8997 chipset

This patch ensures mwifiex_pcie_txbd_empty() does take care
of 8997 chipset.

Fixes: 6d85ef00d9dfe ("mwifiex: add support for 8997 chipset")
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
diff --git a/drivers/net/wireless/marvell/mwifiex/pcie.h b/drivers/net/wireless/marvell/mwifiex/pcie.h
index 7db46ee..347ba45 100644
--- a/drivers/net/wireless/marvell/mwifiex/pcie.h
+++ b/drivers/net/wireless/marvell/mwifiex/pcie.h
@@ -342,6 +342,7 @@
 			return 1;
 		break;
 	case PCIE_DEVICE_ID_MARVELL_88W8897:
+	case PCIE_DEVICE_ID_MARVELL_88W8997:
 		if (((card->txbd_wrptr & reg->tx_mask) ==
 		     (rdptr & reg->tx_mask)) &&
 		    ((card->txbd_wrptr & reg->tx_rollover_ind) ==