arm64: dts: qcom: Add Fxtec Pro1X (QX1050) DTS

The F(x)tec Pro1X is a mobile phone released by FX Technologies Ltd
in 2022.

The phone is exactly the same as the Pro1 released in 2019 with some
changes:
- MSM8998 -> SM6115
- Camera button is no longer multistate
- Only one 48MP back camera
- A new keyboard layout picked by the community.

This commit has the following features working:
- Display (using simplefb)
- UFS
- Power and volume buttons
- Pinctrl
- RPM Regulators
- USB (Device Mode)

To get a successful boot run:

cat arch/arm64/boot/Image.gz arch/arm64/boot/dts/qcom/\
sm6115-fxtec-pro1x.dtb  > .Image.gz-dtb

mkbootimg --kernel .Image.gz-dtb \
--ramdisk initrd.img \
--base 0x0 \
--kernel_offset 0x8000 \
--ramdisk_offset 0x1000000 \
--second_offset 0xf00000 \
--tags_offset 0x100 \
--pagesize 4096 \
--cmdline "CMDLINE HERE" \
-o qx1050-boot.img

fastboot flash boot qx1050-boot.img
fastboot erase dtbo
fastboot reboot

Signed-off-by: Dang Huynh <danct12@riseup.net>
Reviewed-by: Caleb Connolly <caleb.connolly@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230505-fxtec-pro1x-support-v3-2-0c9c7f58b205@riseup.net