ryu: Add mainboard_init_xxx functions to get it building again

Rush has its EC on SPI, and Ryu has it on I2C, so need both
mainboard_init_ec_spi and mainboard_init_ec_i2c in both builds,
due to romstage.c being in the common tegra132 subdir.

BUG=none
BRANCH=rush_ryu
TEST=Built both rush and rush_ryu images OK. Will try to
boot on Ryu later.

Change-Id: Iddbf9e9f6de7ba7244f9dd2e810fb6178937c85a
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 4d8b81717c366d19b43964bed3c4047598db4495
Original-Change-Id: I48d9530697d5669177ecd9ba3c34360197002003
Original-Signed-off-by: Tom Warren <twarren@nvidia.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/210595
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Original-Commit-Queue: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/8900
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/soc/nvidia/tegra132/include/soc/romstage.h

@@ -23,5 +23,7 @@
 void mainboard_configure_pmc(void);
 void mainboard_enable_vdd_cpu(void);
 void mainboard_init_tpm_i2c(void);
+void mainboard_init_ec_spi(void);
+void mainboard_init_ec_i2c(void);
 
 #endif /* __SOC_NVIDIA_TEGRA132_SOC_ROMSTAGE_H__ */

src/soc/nvidia/tegra132/romstage.c

@@ -68,6 +68,8 @@ void romstage(void)
 	printk(BIOS_INFO, "T132 romstage: MTS loading done\n");
 
 	mainboard_init_tpm_i2c();
+	mainboard_init_ec_spi();
+	mainboard_init_ec_i2c();
 
 	entry = cbfs_load_stage(CBFS_DEFAULT_MEDIA,
 				CONFIG_CBFS_PREFIX "/ramstage");