x86/fpu: Include vmalloc.h for vzalloc()

Explicitly include that header to avoid build errors when vzalloc()
becomes "invisible" to the compiler due to header reorganizations.

This is not a problem in the tip tree but occurred when integrating
linux-next.

 [ bp: Commit message. ]

Link: https://lore.kernel.org/r/[email protected]
Fixes: 69f6ed1 ("x86/fpu: Provide infrastructure for KVM FPU cleanup")
Signed-off-by: Stephen Rothwell <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>

Author: sfrothwell

arch/x86/kernel/fpu/core.c

@@ -16,6 +16,7 @@
 
 #include <linux/hardirq.h>
 #include <linux/pkeys.h>
+#include <linux/vmalloc.h>
 
 #include "context.h"
 #include "internal.h"