community/firmware-<sdm845>: use new hexagonrpcd paths and add sensor support for xiaomi-beryllium

Gets the sensors working on xiaomi-beryllium

based on !5035 (closed)

Todo

• hexagonrcpd to 0.3.1
• fix hexagonfs paths for beryllium (still needs polishing)
• update firmware package to include sensor files
• fix orientation matrix
• fix hexagonrcpd service files

output from monitor-sensor:

$ sudo monitor-sensor 
    Waiting for iio-sensor-proxy to appear
+++ iio-sensor-proxy appeared
=== Has accelerometer (orientation: bottom-up)
=== Has ambient light sensor (value: 10.000000, unit: lux)
=== Has proximity sensor (near: 0)
    Light changed: 9.000000 (lux)
    Proximity value changed: 1
    Light changed: 7.000000 (lux)
    Light changed: 4.000000 (lux)
    Light changed: 2.000000 (lux)
    Light changed: 1.000000 (lux)
    Light changed: 2.000000 (lux)
    Light changed: 5.000000 (lux)
    Proximity value changed: 0
    Light changed: 9.000000 (lux)
    Light changed: 10.000000 (lux)
    Light changed: 11.000000 (lux)
    Light changed: 12.000000 (lux)
    Light changed: 13.000000 (lux)
    Accelerometer orientation changed: left-up
    Light changed: 16.000000 (lux)
    Light changed: 19.000000 (lux)
    Light changed: 45.000000 (lux)
    Light changed: 55.000000 (lux)
    Accelerometer orientation changed: normal