intel/skylake: add nhlt support

The use of a NHLT table is required to make audio work
on the skylake SoCs employing the internal DSP. The table
describes the audo endpoints (render vs capture) along with
their supported formats. These formats are not only dependent
on the audio peripheral but also hardware interfaces. As such
each format has an associated blob of DSP settings to make
the peripheral work. Lastly, each of these settings are provided
by Intel and need to be generated for each device's hardware
connection plus mode/format it supports. This patch does not
include the dsp setting blobs.

The current supported connections:
- digital mic array 2 channel
- digital mic array 4 channel
- Maxim 98357 amplifier
- ADI ssm4567
- NAU88L25 headset codec

BUG=chrome-os-partner:44481
BRANCH=None
TEST=Built glados. Speakers, headphones, and mic on camera decently
     worked.
CQ-DEPEND=CL:*239598

Change-Id: If1a9be97573b9b160893944661790cac7df26fca
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 1f5514e27811c500732de97e1cc7edeced2607e7
Original-Change-Id: Ib42e895f00e7605cb30ce24d9b8dd00bf68a7477
Original-Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/313998
Original-Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://review.coreboot.org/12938
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

src/soc/intel/skylake/Kconfig

@@ -11,6 +11,7 @@ config CPU_SPECIFIC_OPTIONS
 	select ARCH_RAMSTAGE_X86_32
 	select ARCH_ROMSTAGE_X86_32
 	select ARCH_VERSTAGE_X86_32
+	select ACPI_NHLT
 	select BACKUP_DEFAULT_SMM_REGION
 	select CACHE_MRC_SETTINGS
 	select CACHE_RELOCATED_RAMSTAGE_OUTSIDE_CBMEM if RELOCATABLE_RAMSTAGE
@@ -139,4 +140,34 @@ config CHIPSET_BOOTBLOCK_INCLUDE
 	string
 	default "soc/intel/skylake/bootblock/timestamp.inc"
 
+config NHLT_DMIC_2CH
+	bool
+	default n
+	help
+	  Include DSP firmware settings for 2 channel DMIC array.
+
+config NHLT_DMIC_4CH
+	bool
+	default n
+	help
+	  Include DSP firmware settings for 4 channel DMIC array.
+
+config NHLT_NAU88L25
+	bool
+	default n
+	help
+	  Include DSP firmware settings for nau88l25 headset codec.
+
+config NHLT_MAX98357
+	bool
+	default n
+	help
+	  Include DSP firmware settings for max98357 amplifier.
+
+config NHLT_SSM4567
+	bool
+	default n
+	help
+	  Include DSP firmware settings for ssm4567 smart amplifier.
+
 endif