psp_verstage: differentiate bios entry

AMDFW tool stores bios dir entry to bios1_entry in picasso but
bios3_entry in cezanne. Separate getting bios_dir_addr into a function
and implement it on each platforms.

Signed-off-by: Kangheui Won <khwon@chromium.org>
Change-Id: Ie18ed7979a04319c074b9b251130d419dc7f22dc
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52964
Reviewed-by: Martin Roth <martinroth@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/amd/picasso/psp_verstage/chipset.c

@@ -18,3 +18,8 @@ uint32_t get_max_workbuf_size(uint32_t *size)
 {
 	return svc_get_max_workbuf_size(size);
 }
+
+uint32_t get_bios_dir_addr(struct psp_ef_table *ef_table)
+{
+	return ef_table->bios1_entry;
+}