use vector<uint8_t> for byte[] in AIDL

In native world, byte stream is typically represented in uint8_t[]
or vector<uint8_t>. C++ backend already generates that way. This
change involves NDK backend.

Now NDK backend also uses vector<uint8_t> just like C++ backend.

Bug: 144957764
Test: atest CtsNdkBinderTestCases
Merged-In: I8de348b57cf92dd99b3ee16252f56300ce5f4683
Change-Id: I8de348b57cf92dd99b3ee16252f56300ce5f4683
(cherry picked from commit 9070318462e5e73acf1509cf7e75ac260e51e43a)

Exempt-From-Owner-Approval: cp from internal
diff --git a/identity/aidl/default/Util.cpp b/identity/aidl/default/Util.cpp
index a0f86be..66b9f13 100644
--- a/identity/aidl/default/Util.cpp
+++ b/identity/aidl/default/Util.cpp
@@ -39,21 +39,12 @@
     return hardwareBoundKey;
 }
 
-vector<uint8_t> byteStringToUnsigned(const vector<int8_t>& value) {
-    return vector<uint8_t>(value.begin(), value.end());
-}
-
-vector<int8_t> byteStringToSigned(const vector<uint8_t>& value) {
-    return vector<int8_t>(value.begin(), value.end());
-}
-
 vector<uint8_t> secureAccessControlProfileEncodeCbor(const SecureAccessControlProfile& profile) {
     cppbor::Map map;
     map.add("id", profile.id);
 
     if (profile.readerCertificate.encodedCertificate.size() > 0) {
-        map.add("readerCertificate",
-                cppbor::Bstr(byteStringToUnsigned(profile.readerCertificate.encodedCertificate)));
+        map.add("readerCertificate", cppbor::Bstr(profile.readerCertificate.encodedCertificate));
     }
 
     if (profile.userAuthenticationRequired) {
@@ -94,7 +85,7 @@
     if (!mac) {
         return false;
     }
-    if (mac.value() != byteStringToUnsigned(profile.mac)) {
+    if (mac.value() != profile.mac) {
         return false;
     }
     return true;