[CPUFREQ] p4-clockmod: add more CPUs

Several more Intel CPUs are now capable using the p4-clockmod cpufreq
driver. As it is of limited use most of the time, print a big bold warning
if a better cpufreq driver might be available.

Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Dave Jones <davej@redhat.com>
diff --git a/include/asm-i386/msr.h b/include/asm-i386/msr.h
index 0aa15fc..8c31887 100644
--- a/include/asm-i386/msr.h
+++ b/include/asm-i386/msr.h
@@ -95,6 +95,8 @@
 
 #define MSR_P6_PERFCTR0		0xc1
 #define MSR_P6_PERFCTR1		0xc2
+#define MSR_FSB_FREQ		0xcd
+
 
 #define MSR_IA32_BBL_CR_CTL		0x119