Revert "libbinder: Choose the binder driver at runtime based on system/vendor process."

This reverts commit 46f95536bec334f8472ea92a7697c37602337398.

Reason for revert: appears to break (some?) native tests, which start looking for binder services in /dev/vndbinder

Change-Id: Id27d90e484d23a5975869729fa274213a9b1e1e4
diff --git a/libs/binder/ProcessState.cpp b/libs/binder/ProcessState.cpp
index 86afffc..3798b61 100644
--- a/libs/binder/ProcessState.cpp
+++ b/libs/binder/ProcessState.cpp
@@ -26,7 +26,6 @@
 #include <utils/String8.h>
 #include <utils/String8.h>
 #include <utils/threads.h>
-#include <vndksupport/linker.h>
 
 #include <private/binder/binder_module.h>
 #include <private/binder/Static.h>
@@ -44,22 +43,16 @@
 #define BINDER_VM_SIZE ((1 * 1024 * 1024) - sysconf(_SC_PAGE_SIZE) * 2)
 #define DEFAULT_MAX_BINDER_THREADS 15
 
-const char* kDefaultVendorDriver = "/dev/vndbinder";
+#ifdef __ANDROID_VNDK__
+const char* kDefaultDriver = "/dev/vndbinder";
+#else
 const char* kDefaultDriver = "/dev/binder";
+#endif
 
 // -------------------------------------------------------------------------
 
 namespace android {
 
-static const char *getDefaultBinderDriver() {
-    // Some libs might have their system variants loaded in a vendor process, so
-    // we cannot depend on a compile time check.
-    if (android_is_in_vendor_process()) {
-        return kDefaultVendorDriver;
-    }
-    return kDefaultDriver;
-}
-
 class PoolThread : public Thread
 {
 public:
@@ -84,7 +77,7 @@
     if (gProcess != nullptr) {
         return gProcess;
     }
-    gProcess = new ProcessState(getDefaultBinderDriver());
+    gProcess = new ProcessState(kDefaultDriver);
     return gProcess;
 }