soc/intel: Unravel `INTEL_TME` Kconfig option

The `INTEL_TME` Kconfig option has a prompt, which means it is meant to
be user-configurable. However, it has been selected from Alder Lake and
Meteor Lake Kconfig, so `INTEL_TME` cannot be disabled on them. Replace
the `select INTEL_TME` statements with default values in order for this
option to be user-configurable on all platforms that support it.

Change-Id: Ib37c108fcc1004840b82be18fd23c340a68ca748
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66756
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Subrata Banik <subratabanik@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Reviewed-by: Tarun Tuli <taruntuli@google.com>

src/soc/intel/alderlake/Kconfig

@@ -71,7 +71,6 @@ config CPU_SPECIFIC_OPTIONS
 	select INTEL_GMA_ACPI
 	select INTEL_GMA_ADD_VBT if RUN_FSP_GOP
 	select INTEL_GMA_OPREGION_2_1
-	select INTEL_TME
 	select MRC_SETTINGS_PROTECT
 	select PARALLEL_MP_AP_WORK
 	select PLATFORM_USES_FSP2_2

src/soc/intel/common/block/cpu/Kconfig

@@ -110,7 +110,7 @@ config CPU_SUPPORTS_INTEL_TME
 config INTEL_TME
 	bool "Total Memory Encryption (TME)/Multi-key TME (MKTME)"
 	depends on CPU_SUPPORTS_INTEL_TME
-	default n
+	default y
 	help
 	 Enable Total Memory Encryption (TME)/Multi-key TME (MKTME). The spec is
 	 available at "https://software.intel.com/sites/default/files/managed/a5

src/soc/intel/meteorlake/Kconfig

@@ -34,7 +34,6 @@ config CPU_SPECIFIC_OPTIONS
 	select INTEL_DESCRIPTOR_MODE_CAPABLE
 	select INTEL_GMA_ACPI
 	select INTEL_GMA_ADD_VBT if RUN_FSP_GOP
-	select INTEL_TME
 	select IOAPIC
 	select MICROCODE_BLOB_UNDISCLOSED
 	select MRC_SETTINGS_PROTECT

src/soc/intel/tigerlake/Kconfig

@@ -145,6 +145,9 @@ config IED_REGION_SIZE
 	hex
 	default 0x400000
 
+config INTEL_TME
+	default n
+
 config HEAP_SIZE
 	hex
 	default 0x10000