arm64: dts: qcom: Add device tree for BQ Aquaris X5 (Longcheer L8910)

arm64: dts: qcom: Add device tree for BQ Aquaris X5 (Longcheer L8910)

BQ Aquaris X5 (Longcheer L8910) is a smartphone using the MSM8916 SoC.

Add device tree with initial support for:

 - SDHCI (internal and external storage)
 - USB Device Mode
 - UART
 - Regulators
 - WiFi/BT
 - Volume buttons
 - Vibrator
 - Touchkeys backlight

This device tree is based on downstream device tree from BQ and from
Longcheer L8915 device tree.

Co-developed-by: Stephan Gerhold <stephan@gerhold.net>
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Signed-off-by: Jonathan Albrieux <jonathan.albrieux@gmail.com>
Link: https://lore.kernel.org/r/20210125094435.7528-2-jonathan.albrieux@gmail.com
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>