Move cutils/log.h to log/log.h.

The log.h file moved, so clean up these references to the old
location.

Change-Id: I25494ea069bfb20fa07a02e67868c8be82e60161
diff --git a/libbacktrace/unwind_remote.c b/libbacktrace/unwind_remote.c
index 1c624d7..ece1e18 100644
--- a/libbacktrace/unwind_remote.c
+++ b/libbacktrace/unwind_remote.c
@@ -19,7 +19,7 @@
 #include <sys/ptrace.h>
 #include <string.h>
 
-#include <cutils/log.h>
+#include <log/log.h>
 #include <backtrace/backtrace.h>
 
 #include <libunwind.h>