soc/intel/apollolake: Enable TPM in bootblock stage

Configure gpio FST_SPI_CS2_N before verstage so that tpm can be
accessed.

Change-Id: I238bf1cd508880b686f0625f28175a80de450971
Signed-off-by: Andrey Petrov <andrey.petrov@intel.com>
Reviewed-on: https://review.coreboot.org/14254
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins)

src/mainboard/intel/apollolake_rvp/Makefile.inc

@@ -0,0 +1,3 @@
+bootblock-$(CONFIG_LPC_TPM) += bootblock.c
+
+

src/mainboard/intel/apollolake_rvp/bootblock.c

@@ -0,0 +1,28 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2016 Intel Corp.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <bootblock_common.h>
+#include <soc/gpio.h>
+
+static const struct pad_config tpm_spi_configs[] = {
+	PAD_CFG_NF(GPIO_106, NATIVE, DEEP, NF3),	/* FST_SPI_CS2_N */
+};
+
+static void tpm_enable(void)
+{
+	/* Configure gpios */
+	gpio_configure_pads(tpm_spi_configs, ARRAY_SIZE(tpm_spi_configs));
+}
+
+void bootblock_mainboard_init(void) {
+	if (IS_ENABLED(CONFIG_LPC_TPM))
+		tpm_enable();
+}