soc/intel/elkhartlake: Skip FSP Notify APIs

Follow this commit 95986169f (soc/intel/alderlake: Skip FSP Notify APIs)
to skip FSP Notify APIs.

Elkhart Lake SoC deselects Kconfigs as below:
- USE_FSP_NOTIFY_PHASE_READY_TO_BOOT
- USE_FSP_NOTIFY_PHASE_END_OF_FIRMWARE
to skip FSP notify APIs (Ready to boot and End of Firmware) and make
use of native coreboot driver to perform SoC recommended operations
prior booting to payload/OS.

When deselecting these Kconfigs, cse_final_ready_to_boot() and
cse_final_end_of_firmware() in the common cse driver will be used
instead as required operations to perform prior to booting to OS.
Check out this CL for further info:
commit 90e318bba (soc/intel/common/cse: Add `finalize` operation for
CSE)

Additionally, create a helper function `heci_finalize()` to keep HECI
related operations separated for easy guarding again config.

Signed-off-by: Lean Sheng Tan <sheng.tan@9elements.com>
Change-Id: I477c204233f83bc96fd5cd39346bff15ed942dc6
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63762
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Subrata Banik <subratabanik@google.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/soc/intel/elkhartlake/Kconfig

@@ -65,8 +65,6 @@ config CPU_SPECIFIC_OPTIONS
 	select UDELAY_TSC
 	select UDK_202005_BINDING
 	select USE_FSP_NOTIFY_PHASE_POST_PCI_ENUM
-	select USE_FSP_NOTIFY_PHASE_READY_TO_BOOT
-	select USE_FSP_NOTIFY_PHASE_END_OF_FIRMWARE
 
 config MAX_CPUS
 	int

src/soc/intel/elkhartlake/finalize.c

@@ -6,6 +6,7 @@
 #include <cpu/x86/smm.h>
 #include <device/mmio.h>
 #include <device/pci.h>
+#include <intelblocks/cse.h>
 #include <intelblocks/lpc_lib.h>
 #include <intelblocks/pcr.h>
 #include <intelblocks/pmclib.h>
@@ -30,12 +31,22 @@ static void pch_finalize(void)
 	pmc_clear_pmcon_sts();
 }
 
+static void heci_finalize(void)
+{
+	heci_set_to_d0i3();
+	if (CONFIG(DISABLE_HECI1_AT_PRE_BOOT))
+		heci1_disable();
+}
+
 static void soc_finalize(void *unused)
 {
 	printk(BIOS_DEBUG, "Finalizing chipset.\n");
 
 	pch_finalize();
 	apm_control(APM_CNT_FINALIZE);
+	if (CONFIG(USE_FSP_NOTIFY_PHASE_READY_TO_BOOT) &&
+		 CONFIG(USE_FSP_NOTIFY_PHASE_END_OF_FIRMWARE))
+		heci_finalize();
 
 	/* Indicate finalize step with post code */
 	post_code(POST_OS_BOOT);