hwc: change error logs to debug logs

There was an error message that should just be a warning messages.
These error logs can cause automation testing to fail.

Change-Id: Ifb205d9f893012e9693628fcd24b2493d7ea51b8
diff --git a/libhwcomposer/hwc_copybit.cpp b/libhwcomposer/hwc_copybit.cpp
index dbb4413..8f2cf55 100644
--- a/libhwcomposer/hwc_copybit.cpp
+++ b/libhwcomposer/hwc_copybit.cpp
@@ -437,7 +437,7 @@
         dtdy > scaleLimitMax ||
         dsdx < 1/scaleLimitMin ||
         dtdy < 1/scaleLimitMin) {
-        ALOGE("%s: greater than max supported size dsdx=%f dtdy=%f \
+        ALOGW("%s: greater than max supported size dsdx=%f dtdy=%f \
               scaleLimitMax=%f scaleLimitMin=%f", __FUNCTION__,dsdx,dtdy,
                                           scaleLimitMax,1/scaleLimitMin);
         return -1;