lib/coreboot_table: add architecture hooks for adding tables

Add a architecture specific function, arch_write_tables(), that
allows an architecture to add its required tables for booting.
This callback helps write_tables() to be de-duplicated.

Change-Id: I805c2f166b1e75942ad28b6e7e1982d64d2d5498
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/14435
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/include/boot/tables.h

@@ -3,6 +3,18 @@
 
 #include <boot/coreboot_tables.h>
 
+/*
+ * Write architecture specific tables as well as the common
+ * coreboot table.
+ */
 void write_tables(void);
 
+/*
+ * Allow per-architecture table writes called from write_tables(). The
+ * coreboot_table parameter provides a reference to where the coreboot
+ * table will be written. The parameter is to allow architectures to
+ * provide a forwarding table to real coreboot table.
+ */
+void arch_write_tables(uintptr_t coreboot_table);
+
 #endif /* BOOT_TABLES_H */