reset: Provide new single-function reset API

board_reset() replaces the existing common reset API. There is no common
distinction between reset types across platforms, hence, common code
could never decide which one to call.

Currently only hard_reset() is used by common code. We replace these
calls and provide a fall-back to the current hard_reset() implemen-
tation. The fall-back will be removed along with hard_reset() after the
transition of all boards.

Change-Id: I274a8cee9cb38226b5a0bdff6a847c74ef0b3128
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/29047
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/security/vboot/Kconfig

@@ -18,7 +18,7 @@ config VBOOT
 	bool "Verify firmware with vboot."
 	default n
 	select VBOOT_MOCK_SECDATA if !TPM1 && !TPM2
-	depends on HAVE_HARD_RESET
+	depends on HAVE_HARD_RESET || !MISSING_BOARD_RESET
 	help
 	  Enabling VBOOT will use vboot to verify the components of the firmware
 	  (stages, payload, etc).

src/security/vboot/vboot_common.c

@@ -129,6 +129,5 @@ void vboot_reboot(void)
 	if (IS_ENABLED(CONFIG_CONSOLE_CBMEM_DUMP_TO_UART))
 		cbmem_dump_console();
 	vboot_platform_prepare_reboot();
-	hard_reset();
-	die("failed to reboot");
+	board_reset();
 }