mb/google/nissa: Create a riven variant

Create the riven variant of nissa reference board by copying the
template files to a new directory named for the variant.

The riven variant is a twinlake platform.

BUG=b:337169542
TEST=util/abuild/abuild -p none -t google/brya -x -a
make sure the build includes GOOGLE_RIVEN

Change-Id: I1be2346d87c891cc0e5fbda094e1f6e0dd60df1b
Signed-off-by: David Wu <david_wu@quanta.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/82132
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Reviewed-by: Eric Lai <ericllai@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/google/brya/Kconfig b/src/mainboard/google/brya/Kconfig
index 88dd555..8400807 100644
--- a/src/mainboard/google/brya/Kconfig
+++ b/src/mainboard/google/brya/Kconfig
@@ -443,6 +443,10 @@
 	select GOOGLE_DSM_PARAM_FILE_NAME if VPD
 	select SOC_INTEL_COMMON_BLOCK_IPU
 
+config BOARD_GOOGLE_RIVEN
+	select BOARD_GOOGLE_BASEBOARD_NISSA
+	select SOC_INTEL_TWINLAKE
+
 config BOARD_GOOGLE_SKOLAS
 	select BOARD_GOOGLE_BASEBOARD_BRYA
 	select DRIVERS_GENERIC_NAU8315
@@ -645,6 +649,7 @@
 	default 0x0 if BOARD_GOOGLE_QUANDISO
 	default 0x1 if BOARD_GOOGLE_REDRIX
 	default 0x3 if BOARD_GOOGLE_REDRIX4ES
+	default 0x0 if BOARD_GOOGLE_RIVEN
 	default 0x1 if BOARD_GOOGLE_SKOLAS
 	default 0x1 if BOARD_GOOGLE_SKOLAS4ES
 	default 0x1 if BOARD_GOOGLE_TAEKO
@@ -733,6 +738,7 @@
 	default "Quandiso" if BOARD_GOOGLE_QUANDISO
 	default "Redrix" if BOARD_GOOGLE_REDRIX
 	default "Redrix4ES" if BOARD_GOOGLE_REDRIX4ES
+	default "Riven" if BOARD_GOOGLE_RIVEN
 	default "Skolas" if BOARD_GOOGLE_SKOLAS
 	default "Skolas4ES" if BOARD_GOOGLE_SKOLAS4ES
 	default "Sundance" if BOARD_GOOGLE_SUNDANCE
@@ -796,6 +802,7 @@
 	default "quandiso" if BOARD_GOOGLE_QUANDISO
 	default "redrix" if BOARD_GOOGLE_REDRIX
 	default "redrix4es" if BOARD_GOOGLE_REDRIX4ES
+	default "riven" if BOARD_GOOGLE_RIVEN
 	default "skolas" if BOARD_GOOGLE_SKOLAS
 	default "skolas4es" if BOARD_GOOGLE_SKOLAS4ES
 	default "sundance" if BOARD_GOOGLE_SUNDANCE