wifi: Add new overlay config to configure SAP supported band

1. Separate supported band config to "overcontrol(All Wifi function" and
"SoftAp)

2. Add 2.4G band configuration (b/175333688, 5G only chip)

3. Move check band to WifiApConfigStore (One place for SAP configuration
vaild check)
The default value:
  a. Default -> True : SAP support 6/60G when chip support 6/60G.
  b. Default -> False : SAP support 6/60G when chip support 6/60G.

Note: Caller can use SoftApCapability#getSupportedChannelList(band) to know if
SAP supported on target band

Related feature request: b/175333688(5G only chip) & b/168046702(Sony, disable 5G
hotspot)
Bug: 175372385
Test: atest -c FrameworksWifiTests

Change-Id: I4838845021ff2c093a067eba18460d1ebde898c1
7 files changed