vc/intel/fsp/mtl: Add UPDs for Acoustic Noise Mitigation

Acoustic noise in PCBs is a common problem and be caused by a variety
of factors, including:

Mechanical vibrations, Electromagnetic interference (EMI) and/or Thermal
expansion.

This patch adds the UPDs to FSPM header file for mitigating the acoustic
noise.

FSPM:
1. AcousticNoiseMitigation
2. FastPkgCRampDisable
3. SlowSlewRate

BUG=b:312405633
TEST=Able to build and boot google/rex.

Change-Id: Iea0bfa2f92bb82e722ffc1a0b2f1e374b32e4ebc
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79301
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Reviewed-by: Eric Lai <ericllai@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: YH Lin <yueherngl@google.com>