[Feature][ZXW-274]ADD AT command to ota GNSS-firmware

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: I2a77c0531bec3833cc38c916382754bb84e27a39
6 files changed