lib/bootmem: allow architecture specific bootmem ranges

A architecture-specific function, named bootmem_arch_add_ranges(),
is added so that each architecture can add entries into the bootmem
memory map. This allows for a common write_tables() implementation
to avoid code duplication.

Change-Id: I834c82eae212869cad8bb02c7abcd9254d120735
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/14434
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/arch/x86/tables.c

@@ -17,6 +17,7 @@
 
 #include <console/console.h>
 #include <cpu/cpu.h>
+#include <bootmem.h>
 #include <boot/tables.h>
 #include <boot/coreboot_tables.h>
 #include <arch/pirq_routing.h>
@@ -180,6 +181,10 @@ static unsigned long write_smbios_table(unsigned long rom_table_end)
 	return rom_table_end;
 }
 
+void bootmem_arch_add_ranges(void)
+{
+}
+
 void write_tables(void)
 {
 	unsigned long low_table_start, low_table_end;