Don't add offsets to ion handles

Fixes a secure buffer addressing offset error in the Widevine
CENC drm engine.

bug: 8667527

Merges the following from Widevine CDM repository:

Allow specification of offset into secure buffer
https://widevine-internal-review.googlesource.com/#/c/5100/

Update WVCryptoPlugin to Pass Output Offset as a Separate Parameter
https://widevine-internal-review.googlesource.com/#/c/5120/

Add offset to secure data buffer in OEMCrypto DecryptCTR
https://widevine-internal-review.googlesource.com/#/c/5110/

Change-Id: Ic3e4b35304c8fbae4aebe4c495285eb787e8c205

libwvdrmengine/mediacrypto/src/WVCryptoPlugin.cpp

@@ -118,7 +118,7 @@ ssize_t WVCryptoPlugin::decrypt(bool secure, const uint8_t key[KEY_ID_SIZE],
       CdmResponseType res = mCDM->Decrypt(mSessionId, false, keyId,
                                           source + offset,
                                           subSample.mNumBytesOfClearData,
-                                          ivVector, 0, dest + offset);
+                                          ivVector, 0, dest, offset);
 
       if (!isCdmResponseTypeSuccess(res)) {
         ALOGE("Decrypt error result in session %s during unencrypted block: %d",
@@ -136,7 +136,8 @@ ssize_t WVCryptoPlugin::decrypt(bool secure, const uint8_t key[KEY_ID_SIZE],
       CdmResponseType res = mCDM->Decrypt(mSessionId, true, keyId,
                                           source + offset,
                                           subSample.mNumBytesOfEncryptedData,
-                                          ivVector, encrypted_offset % 16, dest + offset);
+                                          ivVector, encrypted_offset % 16, dest,
+                                          offset);
 
       if (!isCdmResponseTypeSuccess(res)) {
         ALOGE("Decrypt error result in session %s during encrypted block: %d",