x86/cpu: Remove redundant extern x86_read_arch_cap_msr()

The prototype for the x86_read_arch_cap_msr() function has moved to
arch/x86/include/asm/cpu.h - kill the redundant definition in arch/x86/kernel/cpu.h
and include the header.
Signed-off-by: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Daniel Sneddon <daniel.sneddon@linux.intel.com>
Link: https://lore.kernel.org/r/20221128172451.792595-1-ashok.raj@intel.com

arch/x86/kernel/cpu/bugs.c

@@ -33,6 +33,7 @@
 #include <asm/e820/api.h>
 #include <asm/hypervisor.h>
 #include <asm/tlbflush.h>
+#include <asm/cpu.h>
 
 #include "cpu.h"
 

arch/x86/kernel/cpu/cpu.h

@@ -83,6 +83,4 @@ unsigned int aperfmperf_get_khz(int cpu);
 extern void x86_spec_ctrl_setup_ap(void);
 extern void update_srbds_msr(void);
 
-extern u64 x86_read_arch_cap_msr(void);
-
 #endif /* ARCH_X86_CPU_H */

arch/x86/kernel/cpu/tsx.c

@@ -11,6 +11,7 @@
 #include <linux/cpufeature.h>
 
 #include <asm/cmdline.h>
+#include <asm/cpu.h>
 
 #include "cpu.h"