soc/intel/apollolake: Use MCH_BASE_ADDRESS macro for APL

Systemagent common code will use MCH_BASE_ADDRESS macro,
hence cleaning current APL code to adhere such changes.

Change-Id: Iace1cf786b08221c3955101186509ac5161c3841
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/19793
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/intel/apollolake/chip.c

@@ -273,7 +273,8 @@ static void set_power_limits(void)
 				100 * (pl2_val % power_unit) / power_unit);
 
 	/* Get the MMIO address */
-	rapl_mmio_reg = (void *)(uintptr_t) (MCH_BASE_ADDR + MCHBAR_RAPL_PPL);
+	rapl_mmio_reg = (void *)(uintptr_t) (MCH_BASE_ADDRESS +
+				MCHBAR_RAPL_PPL);
 
 	/* Setting RAPL MMIO register for Power limits.
 	* RAPL driver is using MSR instead of MMIO.