intel/meteorlake: remove skip_mbp_hob SOC chip config

Introduce at new config option CONFIG_FSP_PUBLISH_MBP_HOB to
control the creation of ME_BIOS_PAYLOAD_HOB (MBP HOB) by FSP.

This new option is hooked with `SkipMbpHob` UPD and is always
disabled for ChromeOS platforms.

This made skip_mbp_hob SOC chip config variable redundant
which is also removed as part of this change.

BUG=none
TEST=Build and boot to Google/Rex.

Signed-off-by: Kapil Porwal <kapilporwal@google.com>
Change-Id: Iaba1ea29a92a63d2b287e1ccdea1a81ec07b9971
Reviewed-on: https://review.coreboot.org/c/coreboot/+/71997
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>

src/mainboard/google/rex/variants/rex0/overridetree.cb

@@ -70,8 +70,6 @@ chip soc/intel/meteorlake
 		[PchSerialIoIndexI2C5] = PchSerialIoPci,
 	}"
 
-	register "skip_mbp_hob" = "1"
-
 	# Intel Common SoC Config
 	#+-------------------+---------------------------+
 	#| Field             |  Value                    |

src/soc/intel/meteorlake/Kconfig

@@ -371,4 +371,12 @@ config MTL_USE_COREBOOT_MP_INIT
 
 endchoice
 
+config FSP_PUBLISH_MBP_HOB
+	bool
+	default n if CHROMEOS
+	default y
+	help
+	  This is to control creation of ME_BIOS_PAYLOAD_HOB (MBP HOB) by FSP.
+	  Disabling it for the platforms, which do not use MBP HOB, can improve the boot time.
+
 endif

src/soc/intel/meteorlake/chip.h

@@ -352,12 +352,6 @@ struct soc_intel_meteorlake_config {
 	 * Set this to 1 in order to disable Package C-state demotion.
 	 */
 	bool disable_package_c_state_demotion;
-
-	/*
-	 * Enable or Disable Skipping MBP HOB.
-	 * Default is set to 0 and set to 1 to skip the MBP HOB.
-	 */
-	bool skip_mbp_hob;
 };
 
 typedef struct soc_intel_meteorlake_config config_t;

src/soc/intel/meteorlake/romstage/fsp_params.c

@@ -187,7 +187,7 @@ static void fill_fspm_misc_params(FSP_M_CONFIG *m_cfg,
 	m_cfg->GpioOverride = 0x1;
 
 	/* Skip MBP HOB */
-	m_cfg->SkipMbpHob = config->skip_mbp_hob;
+	m_cfg->SkipMbpHob = !CONFIG(FSP_PUBLISH_MBP_HOB);
 }
 
 static void fill_fspm_audio_params(FSP_M_CONFIG *m_cfg,