amd64_edac: Add per-family init function

Run a per-family init function which does all the settings based on
the family this driver instance is running on. Move the scrubrate
calculation in it and simplify code.

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>

drivers/edac/amd64_edac.h

@@ -461,6 +461,9 @@ struct amd64_pvt {
 	/* MC Type Index value: socket F vs Family 10h */
 	u32 mc_type_index;
 
+	/* DCT per-family scrubrate setting */
+	u32 min_scrubrate;
+
 	/* misc settings */
 	struct flags {
 		unsigned long cf8_extcfg:1;