pinephone: Implement GNSS HAL

[rsglobal]

Step 0:
Using this code enable GNSS in the modem.rc file.

adb shell
$ su
# echo 1 > /sys/class/modem-power/modem-power/device/powered
# cat /dev/ttyUSB1 &
# echo AT+QGPS=1,30,50,0,2 > /dev/ttyUSB2

You should see GPS data on the screen.

To disable GPS:
# echo AT+QGPSEND > /dev/ttyUSB2

Step 1. Try to use [email protected] with existing library:
https://github.com/zxcwhale/android7_gnss_hal_driver

Step 2: Use AOSP GNSS@2 mock implementation and integrate library's logic from Step 1 into it.

[rsglobal]

Now as we have working mm-radio HAL (https://github.com/GloDroid/mm-radio), same approach can be used to bring-up modem-manager based GNSS HAL, (mm-gnss).