soc/intel/apollolake: Use RTC common code

This patch uses common RTC library to enable
upper 128 byte bank of RTC RAM.

Change-Id: I55e196f6c5282d7c0a31b3980da8ae71764df611
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/18700
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins)

src/soc/intel/apollolake/Kconfig

@@ -55,6 +55,7 @@ config CPU_SPECIFIC_OPTIONS
 	select SOC_INTEL_COMMON_BLOCK
 	select SOC_INTEL_COMMON_BLOCK_PCR
 	select SOC_INTEL_COMMON_BLOCK_SA
+	select SOC_INTEL_COMMON_BLOCK_RTC
 	select SOC_INTEL_COMMON_LPSS_I2C
 	select SOC_INTEL_COMMON_SMI
 	select SOC_INTEL_COMMON_SPI_FLASH_PROTECT