mediatek: DTs cleanup
- move SPI-bus info from partition layout DTS
- add SPI chipselect, to remove warnings:
mtk-spi 1100a000.spi: chipselect 0 already in use
spi_master spi0: spi_device register error /soc/spi@1100a000/flash@0
- enable watchdog
- enable HW RNG
Edited by Piotr Kubik