qcacmn: Define new_ch_width in csa_offload_params as phy_ch_width

Currently sme_switch_channel set new_ch_width as phy_ch_width, while
wma_csa_offload_handler set new_ch_width as raw bit in wide bandwidth
channel switch IE.
Clean up the code. Define new_ch_width in csa_offload_params as
phy_ch_width.

Change-Id: Ie1999860421aa60c18cdc8059275954d910b4b66
CRs-Fixed: 3324746

umac/cmn_services/cmn_defs/inc/wlan_cmn_ieee80211.h

@@ -3950,7 +3950,7 @@ struct csa_offload_params {
 	uint32_t csa_chan_freq;
 	uint8_t switch_mode;
 	uint8_t sec_chan_offset;
-	uint8_t new_ch_width;
+	enum phy_ch_width new_ch_width;
 	uint8_t new_op_class;
 	uint8_t new_ch_freq_seg1;
 	uint8_t new_ch_freq_seg2;