VENDOR: Marvell: abox_edge: Enable SPI controller driver

1. Enable Marvell SPI controller and MTD m25p80 driver in kernel config
2. Add SPI pin configuration in dts file
3. Support setting the SPI controller clock dynamically
4. Use GPIO to control the #CS signal of SPI

BUG: 27844484
Change-Id: I3691f37e869dc43599417ed734ea9b9dd4db2944
8 files changed