qca-wifi: Add support for OFDMA UL per user info

Add support for OFDMA UL per user info such as
nss, mcs, ofdma RU start and ofdma RU size for
RX enhanced capture mode.

Change-Id: I5dce2d5ee9fcabc8a782eaf2919a943d4e7921c4

dp/inc/cdp_txrx_extd_struct.h

@@ -40,6 +40,9 @@
  *       <enum 1 bw_40_MHz>
  *       <enum 2 bw_80_MHz>
  *       <enum 3 bw_160_MHz>
+ * @ofdma_info_valid: RU info valid
+ * @ofdma_ru_start_index: RU index number(0-73)
+ * @ofdma_ru_width: size of RU in units of 1(26tone)RU
  * @nss: NSS 1,2, ...8
  * @mcs: MCS index
  * @preamble: preamble