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/arm/tables.c

@@ -17,12 +17,17 @@
 
 #include <console/console.h>
 #include <cpu/cpu.h>
+#include <bootmem.h>
 #include <boot/tables.h>
 #include <boot/coreboot_tables.h>
 #include <string.h>
 #include <cbmem.h>
 #include <lib.h>
 
+void bootmem_arch_add_ranges(void)
+{
+}
+
 #define MAX_COREBOOT_TABLE_SIZE CONFIG_COREBOOT_TABLE_SIZE
 
 void write_tables(void)