[Feature][ZXW-274]ADD AT command to query GNSS-firmware and Satellite system;Modify the start-mode of GNSS to adapt to hardware,Gpio15 changed from output-high to input-hanging

Only Configure: No
Affected branch: master
Affected module: AT
Is it affected on both ZXIC and MTK:only zxic
Self-test: Yes
Doc Update:Yes

Change-Id: I896a1a8f1f13b602c60ae81aee653e5c2f080e9e
4 files changed