liblog: Replace log/log.h with android/log.h

Move all liblog related content into android/log.h, and make
log/log.h points to android/log.h.

Test: Compile
Bug: 26552300
Bug: 31289077
Change-Id: I858e0ebe047b86f2a8530a99bc9c380d3d58edbb
diff --git a/liblog/README b/liblog/README
index df1e68c..eefa80f 100644
--- a/liblog/README
+++ b/liblog/README
@@ -6,7 +6,7 @@
        liblog - Android NDK logger interfaces
 
 SYNOPSIS
-       #include <log/log.h>
+       #include <android/log.h>
 
        ALOG(android_priority, tag, format, ...)
        IF_ALOG(android_priority, tag)