x86: Use a common bus clock for Intel CPUs

Modern Intel CPUs use a standard bus clock value of 100MHz, so put this in
a common file and tidy up the copies.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/cpu/broadwell/cpu_full.c b/arch/x86/cpu/broadwell/cpu_full.c
index d1f3c07..58cc2f3 100644
--- a/arch/x86/cpu/broadwell/cpu_full.c
+++ b/arch/x86/cpu/broadwell/cpu_full.c
@@ -360,7 +360,7 @@
 	msr_write(MSR_IA32_PERF_CTL, perf_ctl);
 
 	debug("cpu: frequency set to %d\n",
-	      ((perf_ctl.lo >> 8) & 0xff) * CPU_BCLK);
+	      ((perf_ctl.lo >> 8) & 0xff) * INTEL_BCLK_MHZ);
 }
 
 int broadwell_init(struct udevice *dev)
@@ -634,7 +634,7 @@
 
 static int broadwell_get_info(struct udevice *dev, struct cpu_info *info)
 {
-	return cpu_intel_get_info(info, BROADWELL_BCLK);
+	return cpu_intel_get_info(info, INTEL_BCLK_MHZ);
 }
 
 static int broadwell_get_count(struct udevice *dev)