spd.h: Move enum ddr3_module_type to ddr3.h

Move specific enum ddr3_module_type to <device/dram/ddr3.h>.

Change-Id: I8fd7892dda26158a5bdd6cd4972c7859a252153e
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/71547
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/include/device/dram/ddr3.h b/src/include/device/dram/ddr3.h
index b109a15..8886e64 100644
--- a/src/include/device/dram/ddr3.h
+++ b/src/include/device/dram/ddr3.h
@@ -32,10 +32,7 @@
 #define SPD_DIMM_PART_LEN	18
 /** @} */
 
-/*
- * Module type (byte 3, bits 3:0) of SPD
- * This definition is specific to DDR3. DDR2 SPDs have a different structure.
- */
+/* Byte 3 [3:0]: DDR3 Module type information */
 enum spd_dimm_type_ddr3 {
 	SPD_DDR3_DIMM_TYPE_UNDEFINED		= 0x00,
 	SPD_DDR3_DIMM_TYPE_RDIMM		= 0x01,