Use the new SPI code from common folder, delete spi.c. SPI related macros
must be single defined, in southbridge.h if they are used by files other
than the common SPI code, fch_spi.h if they are only used by the common
SPI code. The only exception is SPI_FIFO_DEPTH which must be in southbridge.h,
because it can change between SOC.
BUG=b:136595978
TEST=None, code already tested with grunt.
Change-Id: I68008ce076d348adbdabf7b49cec8783dd7134b4
Signed-off-by: Richard Spiegel <richard.spiegel@silverbackltd.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35020
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
65562cd654