aacdec: restore arm32 dequantization optimizations

Unintentionally removed as part of 03cf101645.
Untested, but its assumed that unlike most of the old ARM code,
this one was still working.

libavcodec/aac/aacdec_float.c

@@ -79,6 +79,11 @@ static const float cce_scale[] = {
 #include "aacdec_tab.h"
 #include "libavutil/intfloat.h"
 
+#include "config.h"
+#if ARCH_ARM
+#include "libavcodec/arm/aac.h"
+#endif
+
 #ifndef VMUL2
 static inline float *VMUL2(float *dst, const float *v, unsigned idx,
                            const float *scale)