Revert "Add CAS HAL APEX"

Revert submission 2742398-cas-apex

Reason for revert: culprit for flake b/300311777, verified with go/abtd with 15 runs to make sure the flake is gone https://android-build.googleplex.com/builds/abtd/run/L46500000963034919

Bug:300311777

Reverted changes: /q/submissionid:2742398-cas-apex

Change-Id: Ia13d761d7df501fb30170a69462427198bcf924d
diff --git a/cas/aidl/default/SharedLibrary.cpp b/cas/aidl/default/SharedLibrary.cpp
index 6322ff3..c12d17d 100644
--- a/cas/aidl/default/SharedLibrary.cpp
+++ b/cas/aidl/default/SharedLibrary.cpp
@@ -19,7 +19,6 @@
 #include "SharedLibrary.h"
 #include <dlfcn.h>
 #include <utils/Log.h>
-#include <vndksupport/linker.h>
 
 namespace aidl {
 namespace android {
@@ -27,12 +26,12 @@
 namespace cas {
 
 SharedLibrary::SharedLibrary(const String8& path) {
-    mLibHandle = android_load_sphal_library(path.c_str(), RTLD_NOW);
+    mLibHandle = dlopen(path.c_str(), RTLD_NOW);
 }
 
 SharedLibrary::~SharedLibrary() {
     if (mLibHandle != NULL) {
-        android_unload_sphal_library(mLibHandle);
+        dlclose(mLibHandle);
         mLibHandle = NULL;
     }
 }