hwdb: Endless ELT-NL3 accelerometer support

hwdb: Endless ELT-NL3 accelerometer support

The Endless ELT-NL3 laptop has an accelerometer but its values are
not being interpreted correctly, meaning that it's very easy to end up
with the screen rotated inappropriately.

Add an appropriate mount matrix to correct the values.

P: /devices/LNXSYSTM:00/LNXSYBUS:00/ACCE0001:00
E: DEVPATH=/devices/LNXSYSTM:00/LNXSYBUS:00/ACCE0001:00
E: DRIVER=cmpc_accel_v4
E: ID_VENDOR_FROM_DATABASE=Accton Technology Corporation
E: MODALIAS=acpi:ACCE0001:
E: SUBSYSTEM=acpi

P: /devices/LNXSYSTM:00/LNXSYBUS:00/ACCE0001:00/input/input8
E: ABS=7
E: ACCEL_MOUNT_MATRIX=0, 1, 0; 0, 0, -1; -1, 0, 0
E: DEVPATH=/devices/LNXSYSTM:00/LNXSYBUS:00/ACCE0001:00/input/input8
E: EV=9
E: ID_FOR_SEAT=input-acpi-ACCE0001_00
E: ID_INPUT=1
E: ID_INPUT_ACCELEROMETER=1
E: ID_PATH=acpi-ACCE0001:00
E: ID_PATH_TAG=acpi-ACCE0001_00
E: IIO_SENSOR_PROXY_TYPE=input-accel
E: MODALIAS=input:b0000v0000p0000e0000-e0,3,kra0,1,2,mlsfw
E: NAME="cmpc_accel_v4"
E: PRODUCT=0/0/0/0
E: PROP=0
E: SUBSYSTEM=input
E: SYSTEMD_WANTS=iio-sensor-proxy.service
E: TAGS=:seat:systemd:

P: /devices/LNXSYSTM:00/LNXSYBUS:00/ACCE0001:00/input/input8/event7
N: input/event7
E: ACCEL_MOUNT_MATRIX=0, 1, 0; 0, 0, -1; -1, 0, 0
E: DEVNAME=/dev/input/event7
E: DEVPATH=/devices/LNXSYSTM:00/LNXSYBUS:00/ACCE0001:00/input/input8/event7
E: ID_INPUT=1
E: ID_INPUT_ACCELEROMETER=1
E: ID_PATH=acpi-ACCE0001:00
E: ID_PATH_TAG=acpi-ACCE0001_00
E: IIO_SENSOR_PROXY_TYPE=input-accel
E: MAJOR=13
E: MINOR=71
E: SUBSYSTEM=input
E: SYSTEMD_WANTS=iio-sensor-proxy.service
E: TAGS=:power-switch:systemd: