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>

arch/x86/include/asm/cpu_common.h

@@ -6,6 +6,11 @@
 #ifndef __ASM_CPU_COMMON_H
 #define __ASM_CPU_COMMON_H
 
+/* Standard Intel bus clock is fixed at 100MHz */
+enum {
+	INTEL_BCLK_MHZ		= 100
+};
+
 struct cpu_info;
 
 /**