soc/amd/picasso: Change all remaining soc names

Convert all remaining stoneyridge names to picasso.

Change-Id: I0ed3eaa5b1d2696448ae18b62c7218de59c61883
Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/33749
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Richard Spiegel <richard.spiegel@silverbackltd.com>

src/soc/amd/picasso/cpu.c

@@ -105,7 +105,7 @@ static const struct mp_ops mp_ops = {
 	.post_mp_init = enable_smi_generation,
 };
 
-void stoney_init_cpus(struct device *dev)
+void picasso_init_cpus(struct device *dev)
 {
 	/* Clear for take-off */
 	if (mp_init_with_smm(dev->link_list, &mp_ops) < 0)