soc/intel: Drop pmc_soc_restore_power_failure()

Get rid of this function and its dangerous, weak implementation.
Instead, call pmc_set_power_failure_state() directly from the SMI
handler.

Change-Id: I0718afc5db66447c93289643f9097a4257b10934
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34727
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/soc/intel/apollolake/pmc.c

@@ -105,11 +105,6 @@ void pmc_soc_set_afterg3_en(const bool on)
 	write32(gen_pmcon1, reg32);
 }
 
-void pmc_soc_restore_power_failure(void)
-{
-	pmc_set_power_failure_state(false);
-}
-
 void pmc_soc_init(struct device *dev)
 {
 	const struct soc_intel_apollolake_config *cfg = config_of(dev);