bootstd: cros: Add ARM support

Support booting ChromiumOS on ARM devices using FIT. Add an entry into the
boot implementation which does not require a command line. This can be
expanded over time as the bootm code is refactored.

Signed-off-by: Simon Glass <sjg@chromium.org>

include/bootm.h

@@ -163,4 +163,12 @@ const char *zimage_get_kernel_version(struct boot_params *params,
  */
 void zimage_dump(struct boot_params *base_ptr, bool show_cmdline);
 
+/*
+ * bootm_boot_start() - Boot an image at the given address
+ *
+ * @addr: Image address
+ * @cmdline: Command line to set
+ */
+int bootm_boot_start(ulong addr, const char *cmdline);
+
 #endif