powerpc: cputhreads: Add missing include file

Powerpc builds may fail with the following build error.

Error log:
In file included from ./arch/powerpc/include/asm/mmu_context.h:11:0,
                 from ./include/linux/mmu_context.h:4,
		 from mm/mmu_context.c:8:
./arch/powerpc/include/asm/cputhreads.h: In function 'get_tensr':
./arch/powerpc/include/asm/cputhreads.h:101:2: error:
	implicit declaration of function 'cpu_has_feature'

The problem can be triggered by configuring ppc64e_defconfig and selecting
CONFIG_TICK_CPU_ACCOUNTING instead of CONFIG_VIRT_CPU_ACCOUNTING_NATIVE.

Fixes: b92a226e52 ("powerpc: Move cpu_has_feature() to a separate file")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/include/asm/cputhreads.h

@@ -3,6 +3,7 @@
 
 #ifndef __ASSEMBLY__
 #include <linux/cpumask.h>
+#include <asm/cpu_has_feature.h>
 
 /*
  * Mapping of threads to cores