lib: add common write_tables() implementation

In order to de-duplicate common patterns implement one write_tables()
function. The new write_tables() replaces all the architecture-specific
ones that were largely copied. The callbacks are put in place to
handle any per-architecture requirements.

Change-Id: Id3d7abdce5b30f5557ccfe1dacff3c58c59f5e2b
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/14436
Tested-by: build bot (Jenkins)
Tested-by: Raptor Engineering Automated Test Stand <noreply@raptorengineeringinc.com>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/include/boot/coreboot_tables.h

@@ -5,10 +5,6 @@
 #include <stddef.h>
 /* function prototypes for building the coreboot table */
 
-unsigned long write_coreboot_table(
-	unsigned long low_table_start, unsigned long low_table_end,
-	unsigned long rom_table_start, unsigned long rom_table_end);
-
 /*
  * Write forwarding table of target address at entry address returning size
  * of table written.