arm64: dts: fsl: librem5: Add a device tree for the Librem5 devkit

This is the development kit board for the Librem 5. The current level of
support yields a working console and is able to boot userspace from the
Network or eMMC.

Additional subsystems that are active :

- Both USB ports
- SD card socket
- WWAN modem
- GPIO keys
- LEDs
- gyro
- magnetometer
- touchscreen
- pwm
- backlight
- haptic motor
- sdma
Signed-off-by: default avatarAngus Ainslie (Purism) <>
parent aba01775
Pipeline #5155 passed with stage
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