x86: de-duplicate MONITOR/MWAIT CPUID-related definitions

As of 724b55f ("x86: introduce MWAIT-based, ACPI-less CPU idle
driver") they (also) live in asm/mwait.h; no idea how I missed the
duplicates back at the time.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
Release-Acked-by: Ian Jackson <iwj@xenproject.org>

xen/arch/x86/acpi/lib.c

@@ -24,6 +24,7 @@
 #include <xen/acpi.h>
 #include <asm/apic.h>
 #include <asm/fixmap.h>
+#include <asm/mwait.h>
 
 u32 __read_mostly acpi_smi_cmd;
 u8 __read_mostly acpi_enable_value;

xen/include/asm-x86/cpufeature.h

@@ -22,10 +22,6 @@
 #define cpu_has(c, bit)		test_bit(bit, (c)->x86_capability)
 #define boot_cpu_has(bit)	test_bit(bit, boot_cpu_data.x86_capability)
 
-#define CPUID_MWAIT_LEAF                5
-#define CPUID5_ECX_EXTENSIONS_SUPPORTED 0x1
-#define CPUID5_ECX_INTERRUPT_BREAK      0x2
-
 #define CPUID_PM_LEAF                    6
 #define CPUID6_ECX_APERFMPERF_CAPABILITY 0x1