Move liblog headers to system/core/include/log

Move the liblog headers to log/ instead of cutils/ to complete
the separation of libcutils and liblog.  cutils/log.h still
exists and includes log/log.h in order to support the many existing
modules that use cutils/log.h.

Change-Id: I2758c9f4aedcb809ca7ba8383d0f55041dd44345
diff --git a/liblog/Android.mk b/liblog/Android.mk
index be5cec2..6bfb119 100644
--- a/liblog/Android.mk
+++ b/liblog/Android.mk
@@ -36,6 +36,9 @@
     liblog_sources += \
         logprint.c \
         event_tag_map.c
+else
+    liblog_sources += \
+        uio.c
 endif
 
 liblog_host_sources := $(liblog_sources) fake_log_device.c