qcacmn: Fix build issue on kernel5.10

Fix build issue on kernel5.10.

error: implicit conversion from enumeration type 'enum reg_6g_ap_type'
to different enumeration type 'enum supported_6g_pwr_types'
[-Werror,-Wenum-conversion].

Change-Id: Ib15ed20036f2472b567acee2e4d24d3e6bfe1956
CRs-Fixed: 3154541

umac/regulatory/dispatcher/inc/wlan_reg_services_api.h

@@ -2199,14 +2199,14 @@ wlan_reg_set_ap_pwr_and_update_chan_list(struct wlan_objmgr_pdev *pdev,
 static inline enum supported_6g_pwr_types
 wlan_reg_get_best_6g_pwr_type(struct wlan_objmgr_pdev *pdev, qdf_freq_t freq)
 {
-	return REG_MAX_AP_TYPE;
+	return REG_INVALID_PWR_MODE;
 }
 
 static inline enum supported_6g_pwr_types
 wlan_reg_conv_6g_ap_type_to_supported_6g_pwr_types(enum reg_6g_ap_type
 						   ap_pwr_type)
 {
-	return REG_MAX_AP_TYPE;
+	return REG_INVALID_PWR_MODE;
 }
 
 static inline enum reg_6g_ap_type