x86 chipsets: utilize x86_setup_mtrrs_with_detect()

For all the chipsets which were performing the following sequence:
  x86_setup_fixed_mtrrs();
  x86_setup_var_mtrrs(cpuid_eax(0x80000008) & 0xff, 2);

Replace that with x86_setup_mtrrs_with_detect() since it is equivalent.

Change-Id: I9f362dbf38942d675f615d22b9e5770ce65e5a08
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/13936
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins)
Reviewed-by: Andrey Petrov <andrey.petrov@intel.com>

src/cpu/intel/haswell/haswell_init.c

@@ -717,8 +717,7 @@ static void configure_mca(void)
 static void bsp_init_before_ap_bringup(struct bus *cpu_bus)
 {
 	/* Setup MTRRs based on physical address size. */
-	x86_setup_fixed_mtrrs();
-	x86_setup_var_mtrrs(cpuid_eax(0x80000008) & 0xff, 2);
+	x86_setup_mtrrs_with_detect();
 	x86_mtrr_check();
 
 	initialize_vr_config();