qcacmn: Control the size of the freq and chan_num (GUMAC-SCAN)

Depending on the requirement, a bigger size or a smaller size for
the frequency variable can be chosen. The advantages of each size
are described below:

Advantage of a bigger size:
When two technologies (e.g. 802.11AX and 802.11AD) are controlled
by the same driver software, the frequency range may be very large
and a bigger size (e.g. 32bit integer) is more appropriate.

Advantage of a smaller size:
When the frequency range is not very large, a smaller size
(e.g. 16bit integer) can be used. It saves a large amount of space
especially when many large arrays containing elements of this type/size
are defined in the driver.

Also, change the size of the IEEE channel variables to unsigned
8-bit integer.

Change-Id: I6349c0665bf0a7329627427913f9eebba2821043
CRs-Fixed: 2586177

umac/global_umac_dispatcher/lmac_if/inc/wlan_lmac_if_def.h

@@ -1020,8 +1020,8 @@ struct wlan_lmac_if_reg_rx_ops {
 			enum dfs_reg *dfs_reg);
 	QDF_STATUS (*reg_ch_avoid_event_handler)(struct wlan_objmgr_psoc *psoc,
 			struct ch_avoid_ind_type *ch_avoid_ind);
-	uint32_t (*reg_freq_to_chan)(struct wlan_objmgr_pdev *pdev,
-			uint32_t freq);
+	uint8_t (*reg_freq_to_chan)(struct wlan_objmgr_pdev *pdev,
+				    qdf_freq_t freq);
 	QDF_STATUS (*reg_set_chan_144)(struct wlan_objmgr_pdev *pdev,
 			bool enable_ch_144);
 	bool (*reg_get_chan_144)(struct wlan_objmgr_pdev *pdev);