Update Widevine HIDL service to 1.2.

Widevine HIDL service added new v1.2 media APIs,
update the service to support new APIs.

Merged from http://go/wvgerrit/67083

Test: Netflix and Play Movies & TV (streaming and offline playback)

Test: GTS WidevineH264PlaybackTests test
  e.g. ANDROID_BUILD_TOP= ./android-gts/toolsefed run gts -m GtsMediaTestCases
  --test com.google.android.media.gts.WidevineH264PlaybackTests#testL1With480P30

Test: Widevine unit tests

bug: 117570686
Change-Id: I3a2091e7c62a0d2697ef97f983fd898aedfb4519

libwvdrmengine/src_hidl/WVDrmFactory.cpp

@@ -20,7 +20,7 @@
 namespace wvdrm {
 namespace hardware {
 namespace drm {
-namespace V1_1 {
+namespace V1_2 {
 namespace widevine {
 
 using ::android::hardware::drm::V1_0::Status;
@@ -70,7 +70,7 @@ bool WVDrmFactory::areSpoidsEnabled() {
 
 
 }  // namespace widevine
-}  // namespace V1_1
+}  // namespace V1_2
 }  // namespace drm
 }  // namespace hardware
 }  // namespace wvdrm