soc/intel/cannonlake: Enable x86_64 support

Select HAVE_EXP_X86_64_SUPPORT.

Tested on prodrive/hermes: Boots into Linux.

Change-Id: I033ccd5dc793b637a2ac4271b450335464564885
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58089
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>

src/soc/intel/cannonlake/Kconfig

@@ -7,6 +7,7 @@ config SOC_INTEL_COFFEELAKE
 	select FSP_USES_CB_STACK
 	select HAVE_INTEL_FSP_REPO
 	select SOC_INTEL_CONFIGURE_DDI_A_4_LANES
+	select HAVE_EXP_X86_64_SUPPORT
 
 config SOC_INTEL_WHISKEYLAKE
 	bool