mb/amd/gardenia: Remove IMC support
Per AMD, the Integrated Micro Controller is not a supported feature of the
Stoney Ridge APU. Systems are expected to implement an external EC for
desired features. Remove IMC files and functions from gardenia.
BUG=b:
111780177
TEST=Build gardenia
Change-Id: I570b7f8e364b0c2937592590cc033d5a6c9fade0
Signed-off-by: Richard Spiegel <richard.spiegel@silverbackltd.com>
Reviewed-on: https://review.coreboot.org/27650
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-by: Martin Roth <martinroth@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>