mb/google/arcada: Add settings for noise mitgation

Enable acoustic noise mitgation for arcada platform,
the slow slew rates for Ia and Gt are fast time dived by 8.

BUG=b:131144464
TEST=waveform test and hardware validation result pass.

Signed-off-by: nathan chen <nathan_chen@wistron.corp-partner.google.com>
Change-Id: I37315ecfa245fce3085e62d1566ff037d8aa8ab4
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32403
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-by: Lijian Zhao <lijian.zhao@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 20 insertions, 0 deletions

diff --git a/coreboot b/coreboot
new file mode 160000
+Subproject 1db39a44661f57c2ffe0d795e21c0a4d5dddb49