[hw/sw] move spi_host to peripheral, fix dma hal, fix i2s app

[davideschiavone]

• [x] Questasim 1toM on_chip

• [x] Questasim 1toM flash_load

• [x] Questasim 1toM flash_exec

• [x] Questasim NtoM on_chip

• [x] Questasim NtoM flash_load

• [x] Questasim NtoM flash_exec

• [x] Vivado synthesis

• [x] Vivado synthesis minimal cfg