spd.h: Move enum ddr5_module_type to ddr5.h

Move specific enum ddr5_module_type to <device/dram/ddr5.h>.

Change-Id: Ie38d1e99fa46c278e60ced2d3eef29ca823d4b1d
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/82123
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jakub Czapiga <czapiga@google.com>

tests/lib/dimm_info_util-test.c

@@ -2,6 +2,7 @@
 
 #include <device/dram/ddr2.h>
 #include <device/dram/ddr3.h>
+#include <device/dram/ddr5.h>
 #include <dimm_info_util.h>
 #include <spd.h>
 #include <tests/test.h>