x86, mtrr: make mtrr_aps_delayed_init static bool

mtr_aps_delayed_init was declared u32 and made global, but it only
ever takes boolean values and is only ever used in
arch/x86/kernel/cpu/mtrr/main.c.  Declare it "static bool" and remove
external references.
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>

arch/x86/include/asm/mtrr.h

@@ -126,7 +126,6 @@ extern void mtrr_aps_init(void);
 extern void mtrr_bp_restore(void);
 extern int mtrr_trim_uncached_memory(unsigned long end_pfn);
 extern int amd_special_default_mtrr(void);
-extern u32 mtrr_aps_delayed_init;
 #  else
 static inline u8 mtrr_type_lookup(u64 addr, u64 end)
 {

arch/x86/kernel/cpu/mtrr/main.c

@@ -58,7 +58,7 @@ unsigned int mtrr_usage_table[MTRR_MAX_VAR_RANGES];
 static DEFINE_MUTEX(mtrr_mutex);
 
 u64 size_or_mask, size_and_mask;
-u32 mtrr_aps_delayed_init;
+static bool mtrr_aps_delayed_init;
 
 static struct mtrr_ops *mtrr_ops[X86_VENDOR_NUM];
 
@@ -758,7 +758,7 @@ void set_mtrr_aps_delayed_init(void)
 	if (!use_intel())
 		return;
 
-	mtrr_aps_delayed_init = 1;
+	mtrr_aps_delayed_init = true;
 }
 
 /*
@@ -770,7 +770,7 @@ void mtrr_aps_init(void)
 		return;
 
 	set_mtrr(~0U, 0, 0, 0);
-	mtrr_aps_delayed_init = 0;
+	mtrr_aps_delayed_init = false;
 }
 
 void mtrr_bp_restore(void)