remove extraneous `using namespace android` and deprecate utils/Log.h

This namespace is not used by this file and its declaration is removed
in a separate CL from utils/Log.h, which is the only place it is
defined, so we must remove this extraneous line.

Also, since that separate CL is deprecating utils/Log.h in favor of
log/log.h, we make the switch to the new header.

Test: Build
Exempt-From-Owner-Approval: Owners file needs updating
Change-Id: I34aa80765d30c79f8cb67eaf95a9995066bd672e
diff --git a/media/libaaudio/src/client/IsochronousClockModel.cpp b/media/libaaudio/src/client/IsochronousClockModel.cpp
index 1de33bb..edf6e97 100644
--- a/media/libaaudio/src/client/IsochronousClockModel.cpp
+++ b/media/libaaudio/src/client/IsochronousClockModel.cpp
@@ -16,7 +16,7 @@
 
 #define LOG_TAG "AAudio"
 //#define LOG_NDEBUG 0
-#include <utils/Log.h>
+#include <log/log.h>
 
 #include <stdint.h>
 
@@ -25,7 +25,6 @@
 
 #define MIN_LATENESS_NANOS (10 * AAUDIO_NANOS_PER_MICROSECOND)
 
-using namespace android;
 using namespace aaudio;
 
 IsochronousClockModel::IsochronousClockModel()