mainboard/google/poppy/variants/soraka: add soraka board

Create Soraka board which derives from Poppy, a KBL reference board.
More Soraka specific changes need to be done later on.

BRANCH=master
BUG=b:36995255
TEST=Build (as initial setup)

Change-Id: I8af68d2cf475df56336aa0e3bebe86a54ece1999
Signed-off-by: YH Lin <yueherngl@chromium.org>
Reviewed-on: https://review.coreboot.org/19343
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins)
Reviewed-by: Furquan Shaikh <furquan@google.com>
diff --git a/src/mainboard/google/poppy/Kconfig.name b/src/mainboard/google/poppy/Kconfig.name
index b579ea8..e8c6cdc 100644
--- a/src/mainboard/google/poppy/Kconfig.name
+++ b/src/mainboard/google/poppy/Kconfig.name
@@ -1,3 +1,7 @@
 config BOARD_GOOGLE_POPPY
 	bool "Poppy"
 	select BOARD_GOOGLE_BASEBOARD_POPPY
+
+config BOARD_GOOGLE_SORAKA
+	bool "Soraka"
+	select BOARD_GOOGLE_BASEBOARD_POPPY