nb/intel/sandybridge: Rename and clean up `discover_edges_write`

This is actually an (incomplete) aggressive read training algorithm.
Rename functions and variables accordingly, and tidy up declarations.

Tested on Asus P8H61-M PRO, still boots.

Change-Id: I8a4900f8e3acffe4e4d75a51a2588ad6b65eb411
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47679
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
diff --git a/src/northbridge/intel/sandybridge/raminit_common.h b/src/northbridge/intel/sandybridge/raminit_common.h
index 44f4768..050aa70 100644
--- a/src/northbridge/intel/sandybridge/raminit_common.h
+++ b/src/northbridge/intel/sandybridge/raminit_common.h
@@ -407,7 +407,7 @@
 int write_training(ramctr_timing *ctrl);
 int command_training(ramctr_timing *ctrl);
 int read_mpr_training(ramctr_timing *ctrl);
-int discover_edges_write(ramctr_timing *ctrl);
+int aggressive_read_training(ramctr_timing *ctrl);
 int discover_timC_write(ramctr_timing *ctrl);
 void normalize_training(ramctr_timing *ctrl);
 int channel_test(ramctr_timing *ctrl);