If dlopen("libwvm.so") fails, log the reason why.

Bug: 11342992
Change-Id: I99986b6181df6d7615fdc1520d2edaadaccd9bb4
Frameworks: AudioFlinger: Fix effects memory leak

Patch by: csheng@marvell.com
Change-Id: I4e3032fb34643902f98e8fd7c8e894b6452324c9
Signed-off-by: Yu Yezhong <yuyezhong@gmail.com>