mb/google/octopus: Create Casta variant

This commit create a casta variant for Octopus. The initial settings
override the baseboard GPIO configuration for Touchscreen, LTE, Pen and
Trace modules.

BUG=b:119056117
BRANCH=None
TEST=None

Change-Id: I5d3f7df66981d84fb47a6aa248480ef53dfd90d0
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@google.com>
Reviewed-on: https://review.coreboot.org/c/29763
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/mainboard/google/octopus/Kconfig.name

@@ -46,3 +46,9 @@ config BOARD_GOOGLE_AMPTON
 	select BASEBOARD_OCTOPUS_LAPTOP
 	select BOARD_GOOGLE_BASEBOARD_OCTOPUS
 	select NHLT_RT5682 if INCLUDE_NHLT_BLOBS
+
+config BOARD_GOOGLE_CASTA
+	bool "->  Casta"
+	select BASEBOARD_OCTOPUS_LAPTOP
+	select BOARD_GOOGLE_BASEBOARD_OCTOPUS
+	select NHLT_DA7219 if INCLUDE_NHLT_BLOBS