soc/intel/xeon_sp/skx: Hook up microcode blob

TESTED on ocp/tiagopass: Microcode updates are properly applied (via
FIT). Tested with out of tree patches to report the revision.

Change-Id: I05ddc64090424aa333848d9a0f54f21538faf94c
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48559
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/soc/intel/xeon_sp/Kconfig

@@ -57,7 +57,6 @@ config	CPU_SPECIFIC_OPTIONS
 	select TSC_MONOTONIC_TIMER
 	select UDELAY_TSC
 	select SUPPORT_CPU_UCODE_IN_CBFS
-	select MICROCODE_BLOB_NOT_HOOKED_UP
 	select CPU_INTEL_FIRMWARE_INTERFACE_TABLE
 	select FSP_CAR
 	select CPU_INTEL_COMMON_SMM