import SPL files for board_i2c_{claim,release}_bus()

This imports SPL (second phase loader) files from U-Boot. Most of the
content of these files will eventually go away since they're fairly
U-Boot specific. For now they are here to make Jenkins happy.

Change-Id: Ib3a365ecb9dc304b20f7c1c06665aad2c0c53e69
Signed-off-by: David Hendricks <dhendrix@chromium.org>
Reviewed-on: http://review.coreboot.org/2081
Tested-by: build bot (Jenkins)
Reviewed-by: Hung-Te Lin <hungte@chromium.org>

src/cpu/samsung/exynos5-common/spl.h

@@ -91,4 +91,8 @@ struct spl_machine_param *spl_get_machine_params(void);
  */
 void spl_early_init(void);
 
+/* FIXME(dhendrix): for early i2c init */
+void board_i2c_release_bus(int node);
+int board_i2c_claim_bus(int node);
+
 #endif /* __ASM_ARCH_EXYNOS_SPL_H__ */