Load legacy HAL modules from the sphal namespace

'vndk' namespace should not have /vendor/lib/* in its search paths.
However, /vendor/lib/* has been included due to libhardware; it should
be able to load HAL libs in /vendor/lib and /vendor/lib/hw.

Since the HAL libs are not vndk but part of SP-HAL, they are loaded
explicitly from the 'sphal' namespace.

Bug: 37731053
Bug: 37323945
Test: sailfish builds and boots successfuly
Test: BOARD_VNDK_VERSION=current m libhardware.vendor successful
Change-Id: I1e1619de7deaa0e6610180e585bd7775887bc562
diff --git a/hardware.c b/hardware.c
index 7e4debe..37b61c4 100644
--- a/hardware.c
+++ b/hardware.c
@@ -29,6 +29,8 @@
 #define LOG_TAG "HAL"
 #include <log/log.h>
 
+#include <vndksupport/linker.h>
+
 /** Base path of the hal modules */
 #if defined(__LP64__)
 #define HAL_LIBRARY_PATH1 "/system/lib64/hw"
@@ -80,7 +82,7 @@
      * dlopen returns. Since RTLD_GLOBAL is not or'd in with
      * RTLD_NOW the external symbols will not be global
      */
-    handle = dlopen(path, RTLD_NOW);
+    handle = android_load_sphal_library(path, RTLD_NOW);
     if (handle == NULL) {
         char const *err_str = dlerror();
         ALOGE("load: module=%s\n%s", path, err_str?err_str:"unknown");