cpu/x86/mp_init: move printing of failure message into mp_init_with_smm

Each CPU/SoC checks the return value of the mp_init_with_smm and prints
the same error message if it wasn't successful, so move this check and
printk to mp_init_with_smm. For this the original mp_init_with_smm
function gets renamed to do_mp_init_with_smm and a new mp_init_with_smm
function is created which then calls do_mp_init_with_smm, prints the
error if it didn't return CB_SUCCESS and passes the return value of
do_mp_init_with_smm to its caller.

Since no CPU/SoC code handles a mp_init_with_smm failure apart from
printing a message, also add a comment at the mp_init_with_smm call
sites that the code might want to handle a failure.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I181602723c204f3e43eb43302921adf7a88c81ed
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58498
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>

src/cpu/x86/mp_init.c

@@ -1095,7 +1095,7 @@ static void fill_mp_state(struct mp_state *state, const struct mp_ops *ops)
 		mp_state.ops.per_cpu_smm_trigger = smm_initiate_relocation;
 }
 
-enum cb_err mp_init_with_smm(struct bus *cpu_bus, const struct mp_ops *mp_ops)
+static enum cb_err do_mp_init_with_smm(struct bus *cpu_bus, const struct mp_ops *mp_ops)
 {
 	enum cb_err ret;
 	void *default_smm_area;
@@ -1142,3 +1142,13 @@ enum cb_err mp_init_with_smm(struct bus *cpu_bus, const struct mp_ops *mp_ops)
 
 	return ret;
 }
+
+enum cb_err mp_init_with_smm(struct bus *cpu_bus, const struct mp_ops *mp_ops)
+{
+	enum cb_err ret = do_mp_init_with_smm(cpu_bus, mp_ops);
+
+	if (ret != CB_SUCCESS)
+		printk(BIOS_ERR, "MP initialization failure.\n");
+
+	return ret;
+}