Include what you use

This doesn't need utils/Log.h, just log/log.h and some stdlib headers.

Bug: 33241851
Test: m -j libhardware
Change-Id: Id73059f5636af42b0d1680b89f6ca27f466d9ea8

Android.bp

@@ -14,6 +14,7 @@ cc_library_shared {
         "liblog",
         "libdl",
     ],
+    header_libs: ["libsystem_headers"],
     cflags: ["-DQEMU_HARDWARE"],
     export_include_dirs: ["include"],
 }

hardware.c

@@ -23,9 +23,11 @@
 #include <pthread.h>
 #include <errno.h>
 #include <limits.h>
+#include <stdio.h>
+#include <unistd.h>
 
 #define LOG_TAG "HAL"
-#include <utils/Log.h>
+#include <log/log.h>
 
 /** Base path of the hal modules */
 #if defined(__LP64__)