arm64: dts: qcom: msm8916-lenovo-phab: add device

[oknyshuk]

Lenovo PHAB (PB1-750M) is a phablet using the MSM8916 SoC released in late 2015.

Add a device tree with initial support for:

• GPIO keys
• Display & touchscreen
• pm8916-vibrator
• SDHCI (internal and external storage)
• USB Device Mode
• BMS & charging
• UART (not tested)
• WCNSS (WiFi/BT)
• Modem (LTE works, calls & SMS not tested)
• Regulators
• Sound (WIP)
• Accelerometer (WIP)

Signed-off-by: Oleksandr Knyshuk [email protected]