lib/spd_bin: make SMBus SPD addresses an input

Instead of assuming the mapping of dimm number to SPD SMBus address,
allow the mainboard to provide its own mapping. That way, global
resources of empty SPD contents aren't wasted in order to address
a dimm on a mainboard that doesn't meet the current assumption.

Change-Id: Id0e79231dc2303373badaae003038a1ac06a5635
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/19915
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Naresh Solanki <naresh.solanki@intel.com>

src/include/spd_bin.h

@@ -43,6 +43,7 @@
 #define LPDDR4_SPD_PART_LEN	20
 
 struct spd_block {
+	u8 addr_map[CONFIG_DIMM_MAX];
 	u8 *spd_array[CONFIG_DIMM_MAX];
 	/* Length of each dimm */
 	u16 len;