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/arch-broadwell/cpu.h

@@ -21,9 +21,6 @@
 #define CPUID_BROADWELL_D0	0x306d3
 #define CPUID_BROADWELL_E0	0x306d4
 
-/* Broadwell bus clock is fixed at 100MHz */
-#define BROADWELL_BCLK		100
-
 #define BROADWELL_FAMILY_ULT	0x306d0
 
 #define CORE_THREAD_COUNT_MSR		0x35

arch/x86/include/asm/arch-broadwell/pch.h

@@ -6,9 +6,6 @@
 #ifndef __ASM_ARCH_PCH_H
 #define __ASM_ARCH_PCH_H
 
-/* CPU bus clock is fixed at 100MHz */
-#define CPU_BCLK		100
-
 #define PMBASE			0x40
 #define ACPI_CNTL		0x44
 #define  ACPI_EN		(1 << 7)

arch/x86/include/asm/arch-ivybridge/model_206ax.h

@@ -8,9 +8,6 @@
 #ifndef _ASM_ARCH_MODEL_206AX_H
 #define _ASM_ARCH_MODEL_206AX_H
 
-/* SandyBridge/IvyBridge bus clock is fixed at 100MHz */
-#define SANDYBRIDGE_BCLK		100
-
 #define  CPUID_VMX			(1 << 5)
 #define  CPUID_SMX			(1 << 6)
 #define MSR_FEATURE_CONFIG		0x13c

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;
 
 /**