fpu: move public header file to include/fpu

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index 8413146..0cfa6b4 100644
--- a/fpu/softfloat.c
+++ b/fpu/softfloat.c
@@ -40,7 +40,7 @@
  */
 #include "config.h"
 
-#include "softfloat.h"
+#include "fpu/softfloat.h"
 
 /*----------------------------------------------------------------------------
 | Primitive arithmetic functions, including multi-word arithmetic, and