overlay: Remove defines of log2f

Was a relic from earlier builds

Change-Id: Icf640a48f35c4caf6e7cbafa527260b040900096
diff --git a/liboverlay/overlayMdp.cpp b/liboverlay/overlayMdp.cpp
index d36c975..3af9eaa 100644
--- a/liboverlay/overlayMdp.cpp
+++ b/liboverlay/overlayMdp.cpp
@@ -35,13 +35,6 @@
         return ((int)(f1*100) == (int)(f2*100)) ? true : false;
 }
 
-#ifdef ANDROID_JELLYBEAN_MR1
-//Since this is unavailable on Android 4.2.2, defining it in terms of base 10
-static inline float log2f(const float& x) {
-    return log(x) / log(2);
-}
-#endif
-
 namespace ovutils = overlay::utils;
 namespace overlay {
 
diff --git a/liboverlay/overlayUtils.cpp b/liboverlay/overlayUtils.cpp
index ddba868..0b78e4d 100644
--- a/liboverlay/overlayUtils.cpp
+++ b/liboverlay/overlayUtils.cpp
@@ -284,11 +284,6 @@
     return dscale_factor;
 }
 
-//Since this is unavailable on Android, defining it in terms of base 10
-static inline float log2f(const float& x) {
-    return log(x) / log(2);
-}
-
 void getDecimationFactor(const int& src_w, const int& src_h,
         const int& dst_w, const int& dst_h, float& horDscale,
         float& verDscale) {