mainboard/google: Disable big, pit, and ryu ec builds

The EC builds for nyan_big, peach_pit, and smaug (ryu) have been removed
from the latest EC codebase, so don't try to build them by default
anymore.

Change-Id: I53901b32753c5b9b050f517bbf3f10b9071913d4
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/23826
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/mainboard/google/nyan_big/Kconfig

@@ -79,10 +79,6 @@ config DRIVER_TPM_I2C_ADDR
 	hex
 	default 0x20
 
-config EC_GOOGLE_CHROMEEC_BOARDNAME
-	string
-	default "big"
-
 config GBB_HWID
 	string
 	depends on CHROMEOS

src/mainboard/google/peach_pit/Kconfig

@@ -49,10 +49,6 @@ config UART_FOR_CONSOLE
 	int
 	default 3
 
-config EC_GOOGLE_CHROMEEC_BOARDNAME
-	string
-	default "pit"
-
 config GBB_HWID
 	string
 	depends on CHROMEOS

src/mainboard/google/smaug/Kconfig

@@ -84,10 +84,6 @@ config EC_GOOGLE_CHROMEEC_I2C_BUS
 	hex
 	default 0x1
 
-config EC_GOOGLE_CHROMEEC_BOARDNAME
-	string
-	default "ryu"
-
 config GBB_HWID
 	string
 	depends on CHROMEOS