src: Replace common MSR addresses with macros

Change-Id: I9fba67be12483ea5e12ccd34c648735d409bc8b0
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/29252
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Richard Spiegel <richard.spiegel@silverbackltd.com>

src/include/cpu/x86/msr.h

@@ -14,6 +14,7 @@
 #define  EFER_SCE	(1 << 0)
 
 /* Page attribute type MSR */
+#define TSC_MSR				0x10
 #define IA32_PLATFORM_ID		0x17
 #define IA32_FEATURE_CONTROL		0x3a
 #define  FEATURE_CONTROL_LOCK_BIT	(1 << 0)