google/gru: add board name

Gru is the common name of a set of coreboot boards, each of them has
the config option BOARD_GOOGLE_GRU enabled. Now we need to add the
actual board called Gru to the set. Let's rename the common config
option to BOARD_GOOGLE_GRU_COMMON and use BOARD_GOOGLE_GRU for the
actual board.

BRANCH=none
BUG=none
TEST=with corresponding depthcharge and configuration space changes it
     is possible to build the Gru board which boots the kernel using
     the proper compatibility string of google,gru-rev0

Change-Id: I363d4b690b7549f50ed75d77b56e6a1e1d17b60f
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 327ecc0de20ac0b93ec3cd28ef398393d4ea7c42
Original-Change-Id: Ia43278225c2d32d2af37193a77ea792551c9f8d9
Original-Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/340793
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/14724
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/mainboard/google/gru/Kconfig

@@ -13,10 +13,10 @@
 ## GNU General Public License for more details.
 ##
 
-config BOARD_GOOGLE_GRU  # Umbrella option to be selected by variant boards.
+config BOARD_GOOGLE_GRU_COMMON  # Umbrella option to be selected by variant boards.
 	def_bool n
 
-if BOARD_GOOGLE_GRU
+if BOARD_GOOGLE_GRU_COMMON
 
 config BOARD_SPECIFIC_OPTIONS
 	def_bool y
@@ -65,4 +65,4 @@ config CONSOLE_SERIAL_UART_ADDRESS
 	depends on DRIVERS_UART
 	default 0xFF1A0000
 
-endif # BOARD_GOOGLE_GRU
+endif # BOARD_GOOGLE_GRU_COMMON

src/mainboard/google/gru/Kconfig.name

@@ -1,3 +1,7 @@
 config BOARD_GOOGLE_KEVIN
 	bool "Kevin"
-	select BOARD_GOOGLE_GRU
+	select BOARD_GOOGLE_GRU_COMMON
+
+config BOARD_GOOGLE_GRU
+	bool "Gru"
+	select BOARD_GOOGLE_GRU_COMMON