qcacld-3.0: dp: Replace fallthrough comment with attribute

-Wimplicit-fallthrough is being enabled by default. Some compilers
such as clang require the attribute instead of just a fallthrough comment.

Change-Id: Ie320d97a2df018fb0ad1a39c3fb2683e564d1808
CRs-Fixed: 3217418

core/dp/htt/htt_monitor_rx.c

@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2011-2021 The Linux Foundation. All rights reserved.
- * Copyright (c) 2021 Qualcomm Innovation Center, Inc. All rights reserved.
+ * Copyright (c) 2021-2022 Qualcomm Innovation Center, Inc. All rights reserved.
  *
  * Permission to use, copy, modify, and/or distribute this software for
  * any purpose with or without fee is hereby granted, provided that the
@@ -367,7 +367,7 @@ static void htt_mon_rx_get_phy_info(struct htt_host_rx_desc_base *rx_desc,
 		break;
 	case 8:
 		is_stbc = ((VHT_SIG_A_2(rx_desc) >> 4) & 3);
-		/* fallthrough */
+		fallthrough;
 	case 9:
 		ht_flags = 1;
 		sgi = (VHT_SIG_A_2(rx_desc) >> 7) & 0x01;
@@ -380,7 +380,7 @@ static void htt_mon_rx_get_phy_info(struct htt_host_rx_desc_base *rx_desc,
 	case 0x0c:
 		is_stbc = (VHT_SIG_A_2(rx_desc) >> 3) & 1;
 		ldpc = (VHT_SIG_A_2(rx_desc) >> 2) & 1;
-		/* fallthrough */
+		fallthrough;
 	case 0x0d:
 	{
 		uint8_t gid_in_sig = ((VHT_SIG_A_1(rx_desc) >> 4) & 0x3f);
@@ -410,7 +410,7 @@ static void htt_mon_rx_get_phy_info(struct htt_host_rx_desc_base *rx_desc,
 		}
 		beamformed = (VHT_SIG_A_2(rx_desc) >> 8) & 0x1;
 	}
-		/* fallthrough */
+		fallthrough;
 	default:
 		break;
 	}

core/dp/txrx/ol_txrx.c

@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2011-2021 The Linux Foundation. All rights reserved.
- * Copyright (c) 2021 Qualcomm Innovation Center, Inc. All rights reserved.
+ * Copyright (c) 2021-2022 Qualcomm Innovation Center, Inc. All rights reserved.
  *
  * Permission to use, copy, modify, and/or distribute this software for
  * any purpose with or without fee is hereby granted, provided that the
@@ -4247,7 +4247,7 @@ ol_txrx_fw_stats_handler(ol_txrx_pdev_handle pdev,
 				bytes = 0;
 				/* TO DO: specify how many bytes are present */
 				/* TO DO: add copying to the requestor's buf */
-				/* fallthrough */
+				fallthrough;
 			case HTT_DBG_STATS_RX_REMOTE_RING_BUFFER_INFO:
 				bytes = sizeof(struct
 						rx_remote_buffer_mgmt_stats);