[memmap] Allow explicit colour selection for memory map debug messages

Provide DBGC_MEMMAP() as a replacement for memmap_dump(), allowing the
colour used to match other messages within the same message group.

Retain a dedicated colour for output from memmap_dump_all(), on the
basis that it is generally most useful to visually compare full memory
dumps against previous full memory dumps.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/arch/x86/core/relocate.c

@@ -80,7 +80,7 @@ __asmcall void relocate ( struct i386_all_regs *ix86 ) {
 		 * away with using just 32-bit arithmetic after this
 		 * stage.
 		 */
-		memmap_dump ( &region );
+		DBGC_MEMMAP ( &region, &region );
 		if ( region.min > max ) {
 			DBGC ( &region, "...starts after max=%#08lx\n", max );
 			break;

src/arch/x86/image/multiboot.c

@@ -120,7 +120,7 @@ static void multiboot_build_memmap ( struct image *image,
 		/* Ignore any non-memory regions */
 		if ( ! ( region.flags & MEMMAP_FL_MEMORY ) )
 			continue;
-		memmap_dump ( &region );
+		DBGC_MEMMAP ( image, &region );
 
 		/* Check Multiboot memory map limit */
 		if ( ! remaining ) {