Transceiver52M: Default to 1 sample-per-symbol low powered devices

This includes ARM Cortex A8 and A15 powered device such as Beagle
Board, Gumstix driven E100 USRP, and Arndale board. Set the reduced
SPS value automatically for the user.

For x86, if we don't support SSE3, then the architecture is
probably ancient and not with using. Drop the sampling down anyways
to at least make an attempt. Non floating point SIMD devices (e.g.
Raspberry Pi) also fall in this category

Signed-off-by: Thomas Tsou <tom@tsou.cc>

Transceiver52M/runTransceiver.cpp

@@ -23,7 +23,9 @@
 
 */
 
-
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
 
 #include "Transceiver.h"
 #include "radioDevice.h"
@@ -42,9 +44,14 @@
  *     1 - Uses minimized modulator (less computation, more distortion)
  *
  *     Other values are invalid. Receive path (uplink) is always
- *     downsampled to 1 sps
+ *     downsampled to 1 sps. Default to 4 sps for all cases except for
+ *     ARM and non-SIMD enabled architectures.
  */
-#define SPS                 4
+#if defined(HAVE_NEON) || !defined(HAVE_SSE3)
+#define SPS		1
+#else
+#define SPS		4
+#endif
 
 ConfigurationTable gConfig(CONFIGDB);