wifi: Wifi Setting [3/4]

PD#SWPL-8244

Problem:
Add Wi-fi Setting
Memory_Leak & WifiChannelbyunifykey

Solutioni:
Pre-initialize Wi-Fi settings for cspec.country_abbrev, cspec.ccode
Add unifykeys wifi_disable_5g_band for setting disable_5g_band.
Fix memory lead.
Check the value of unifykes "usid" to determine what values should
be used to pre-initialize cspec
Add More country for wifi channel

Verity:
deadpool

Change-Id: I12f764507c8281eb2b80ee2211a7e142d5075714
Signed-off-by: Liang Ji <liang.ji@amlogic.com>