soc/intel/cannonlake: Select common XHCI code

This patch select CONFIG_SOC_INTEL_COMMON_BLOCK_XHCI to include
common xhci code block.

BUG=b:78109109
BRANCH=none
TEST=Build and boot cnlrvp

Change-Id: I7f1e59792159dae5835fbbe7fcb1604fc01893ba
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/26465
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/intel/cannonlake/Kconfig

@@ -72,6 +72,7 @@ config CPU_SPECIFIC_OPTIONS
 	select SOC_INTEL_COMMON_BLOCK_TIMER
 	select SOC_INTEL_COMMON_BLOCK_UART
 	select SOC_INTEL_COMMON_BLOCK_XDCI
+	select SOC_INTEL_COMMON_BLOCK_XHCI
 	select SOC_INTEL_COMMON_NHLT
 	select SOC_INTEL_COMMON_RESET
 	select SSE2