soc/intel: Replace config_of_path() with config_of_soc()

The previously provided device path made no difference, all
integrated PCI devices point back to the same chip_info
structure.

Change reduces the exposure of various SA_DEVFN_xx and
PCH_DEVFN_xx from (ugly) soc/pci_devs.h.

Change-Id: Ibf13645fdd3ef7fd3d5c8217bb24d7ede045c790
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35656
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/intel/apollolake/cpu.c

@@ -296,7 +296,7 @@ void cpu_lock_sgx_memory(void)
 
 int soc_fill_sgx_param(struct sgx_param *sgx_param)
 {
-	config_t *conf = config_of_path(SA_DEVFN_ROOT);
+	config_t *conf = config_of_soc();
 
 	sgx_param->enable = conf->sgx_enable;
 	return 0;