arm64: dts: visconti: Add DTS for the VisROBO board

This board consists of two boards:
the SoM board (VRC SoM) with the SoC on board, and the board for I/O (VRB).

The functions of each board supported by this update are as follows:
- VRC SoM
- WDT
- GPIO
- SDCard (SPI-MMC mode)
- I2C x1
- VRB board
- VRC SoM
- UART x2
- Ethernet phy

Signed-off-by: Yuji Ishikawa <yuji2.ishikawa@toshiba.co.jp>
Link: https://lore.kernel.org/r/20211014092703.15251-4-yuji2.ishikawa@toshiba.co.jp
Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>

arm64: dts: visconti: Add device tree for TMPV7708 RM main board

Add basic support for the Visconti TMPV7708 SoC peripherals -
- CPU
- CA53 x 4 and 2 cluster.
- not support PSCI, currently only spin-table is supported.
- Interrupt controller (ARM Generic Interrupt Controller)
- Timer (ARM architected timer)
- UART (ARM PL011 UART controller)
- SPI (ARM PL022 SPI controller)
- I2C (Synopsys DesignWare APB I2C Controller)
- Pin control (Visconti specific)

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>
Reviewed-by: Punit Agrawal <punit1.agrawal@toshiba.co.jp>