arm64: dts: mediatek: add dtsi for MT8167

arm64: dts: mediatek: add dtsi for MT8167

The MT8167 SoC provides the following peripherals: GPIO, UART, USB2,
SPI, eMMC, SDIO, NAND, Flash, ADC, I2C, PWM, TImers, IR, Ethernet,
Audio (I2S, SPDIF, TDM, HDMI), HDMI, DSI, CSI, MDP (Multimedia Data
Path), Video encoding (H.264), Video Decoding (H.264, VP8).

The MT8167 is compatible with MT8516 but provides multimedia IPs to it.

This commit is just adding the basic dtsi file with the support of the
following IOs: GPIO, Clocks.

Signed-off-by: Fabien Parent <fparent@baylibre.com>
Link: https://lore.kernel.org/r/20201027194816.1227654-2-fparent@baylibre.com
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>