[WCNCR00166497] misc: Refine 5G band support capability acquisition flow

[Description]
5G band support capability acquisition flow may be confused
by parameter RegInfo->ucSupport5GBand without nvram file.

1. Check efuse/HW 5G band capability first,
2. Check nvram setting in wlanLoadManufactureData function then
   (if nvram existed).

Change-Id: Ie6d57e79469500130c7536b9e6fd7b3b5ecb3cda
Signed-off-by: Glenn Tung <glenn.tung@mediatek.com>
CR-Id: WCNCR00166497
Feature: misc
diff --git a/common/wlan_lib.c b/common/wlan_lib.c
index e69c329..64b9454 100644
--- a/common/wlan_lib.c
+++ b/common/wlan_lib.c
@@ -612,9 +612,8 @@
 
 #endif
 #endif
-
 		/* Check if it is disabled by hardware */
-		if (prAdapter->fgIsHw5GBandDisabled || prRegInfo->ucSupport5GBand == 0)
+		if (prAdapter->fgIsHw5GBandDisabled)
 			prAdapter->fgEnable5GBand = FALSE;
 		else
 			prAdapter->fgEnable5GBand = TRUE;