sb/intel/lynxpoint: Drop unneeded and rotten Kconfig option

Not selecting `ME_MBP_CLEAR_LATE` results in a build failure. Since both
traditional and ULT platforms are known to be working, drop the option.

Change-Id: I09ce27f812966800e36f6c0624c93759089faf45
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44547
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

src/southbridge/intel/lynxpoint/Kconfig

@@ -51,15 +51,6 @@ config SERIRQ_CONTINUOUS_MODE
 	  If you set this option to y, the serial IRQ machine will be
 	  operated in continuous mode.
 
-config ME_MBP_CLEAR_LATE
-	bool "Defer wait for ME MBP Cleared"
-	default y
-	help
-	  If you set this option to y, the Management Engine driver
-	  will defer waiting for the MBP Cleared indicator until the
-	  finalize step.  This can speed up boot time if the ME takes
-	  a long time to indicate this status.
-
 config FINALIZE_USB_ROUTE_XHCI
 	bool "Route all ports to XHCI controller in finalize step"
 	default y

src/southbridge/intel/lynxpoint/me_9.x.c

@@ -548,10 +548,8 @@ void intel_me_finalize_smm(void)
 	if (!mei_base_address || mei_base_address == (u32 *)0xfffffff0)
 		return;
 
-#if CONFIG(ME_MBP_CLEAR_LATE)
 	/* Wait for ME MBP Cleared indicator */
 	intel_me_mbp_clear(PCH_ME_DEV);
-#endif
 
 	/* Make sure ME is in a mode that expects EOP */
 	reg32 = pci_read_config32(PCH_ME_DEV, PCI_ME_HFS);
@@ -927,11 +925,6 @@ static int __unused intel_me_read_mbp(me_bios_payload *mbp_data, struct device *
 	host.interrupt_generate = 1;
 	write_host_csr(&host);
 
-#if !CONFIG(ME_MBP_CLEAR_LATE)
-	/* Wait for the mbp_cleared indicator. */
-	intel_me_mbp_clear(dev);
-#endif
-
 	/* Dump out the MBP contents. */
 	if (CONFIG_DEFAULT_CONSOLE_LOGLEVEL >= BIOS_DEBUG) {
 		printk(BIOS_INFO, "ME MBP: Header: items: %d, size dw: %d\n",