mb, soc: change mainboard_get_dram_part_num() prototype

Change mainboard_get_dram_part_num() to return a constant character
pointer to a null-terminated C string and to take no input
parameters.  This also addresses the issue that different SOCs and
motherboards were using different definitions for
mainboard_get_dram_part_num by consolidating to a single definition.

BUG=b:169774661, b:168724473
TEST="emerge-volteer coreboot && emerge-dedede coreboot && emerge-hatch
coreboot" and verify build completes successfully.

Change-Id: Ie7664eab65a2b9e25b7853bf68baf2525b040487
Signed-off-by: Nick Vaccaro <nvaccaro@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45873
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/soc/intel/cannonlake/include/soc/romstage.h b/src/soc/intel/cannonlake/include/soc/romstage.h
index 4e513f0f3c..f99175f769 100644
--- a/src/soc/intel/cannonlake/include/soc/romstage.h
+++ b/src/soc/intel/cannonlake/include/soc/romstage.h
@@ -8,7 +8,7 @@
 void mainboard_memory_init_params(FSPM_UPD *mupd);
 
 /* Provide a callback to allow mainboard to override the DRAM part number. */
-void mainboard_get_dram_part_num(const char **part_num, size_t *len);
+const char *mainboard_get_dram_part_num(void);
 void systemagent_early_init(void);
 void romstage_pch_init(void);