soc/intel/apollolake: Use common systemagent code

This patch perform resource mapping for PCI,
fixed MMIO, DRAM and IMR's based on inputs given by SoC.

TEST=Ensure PCI root bridge 0:0:0 memory resource allocation
remains same between previous implementation and current
implementation.

Change-Id: I15a3b2fc46ec9063b54379d41996b9a1d612cfd2
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/19795
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/intel/apollolake/Kconfig

@@ -50,6 +50,7 @@ config CPU_SPECIFIC_OPTIONS
 	select RELOCATABLE_RAMSTAGE	# Build fails if this is not selected
 	select RTC
 	select SMM_TSEG
+	select SA_ENABLE_IMR
 	select SOC_INTEL_COMMON
 	select SOC_INTEL_COMMON_ACPI
 	select SOC_INTEL_COMMON_ACPI_WAKE_SOURCE