arch: only print cbmem entries in one place

Each arch was calling cbmem_list() in their own write_tables()
function. Consolidate that call and place it in common code
in write_coreboot_table().

Change-Id: If0d4c84e0f8634e5cef6996b2be4a86cc83c95a9
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/14430
Tested-by: build bot (Jenkins)
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/arch/x86/tables.c

@@ -212,7 +212,4 @@ void write_tables(void)
 		write_coreboot_table(low_table_start, low_table_end,
 				     rom_table_start, rom_table_end);
 	}
-
-	/* Print CBMEM sections */
-	cbmem_list();
 }