mb/google/{beltino,fizz,jecht}: Set Tianocore boot timeout to 5s

These Chromeboxes need more than the 2s default in order to init
an external display and show the boot splash/menu prompt.

Test: build/boot one of each variant, ensure boot splash/menu
prompt visible regardless of display init type used.

Change-Id: Ib90136b7e564451aff638af4d42abd97e42b3c19
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48978
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>

src/mainboard/google/beltino/Kconfig

@@ -62,4 +62,8 @@ config ENABLE_DDR_2X_REFRESH
 config PCIEXP_AER
 	def_bool n
 
+config TIANOCORE_BOOT_TIMEOUT
+	int
+	default 5
+
 endif # BOARD_GOOGLE_BASEBOARD_BELTINO

src/mainboard/google/fizz/Kconfig

@@ -99,4 +99,8 @@ config UART_FOR_CONSOLE
 config USE_PM_ACPI_TIMER
 	default n
 
+config TIANOCORE_BOOT_TIMEOUT
+	int
+	default 5
+
 endif # BOARD_GOOGLE_BASEBOARD_FIZZ

src/mainboard/google/jecht/Kconfig

@@ -59,4 +59,8 @@ config MAINBOARD_SMBIOS_MANUFACTURER
 config PCIEXP_AER
 	def_bool n
 
+config TIANOCORE_BOOT_TIMEOUT
+	int
+	default 5
+
 endif