Refresh Current Key in Level 3

Merge from Widevine repo of http://go/wvgerrit/26780
and http://go/wvgerrit/26740

Previously, in oemcrypto level 3, a session's current key's duration
was not updated until the next call to SelectKey.  This caused
problems with license that only used one key.  This CL fixes that.

arm64/libwvlevel3.a            Level3 Library 7283 May  2 2017 13:16:21
arm/libwvlevel3.a              Level3 Library 4445 May  2 2017 11:49:34
x86_64/libwvlevel3.a           Level3 Library 7284 May  2 2017 12:09:21
x86/libwvlevel3.a              Level3 Library 4464 May  2 2017 11:53:46

Test: unit tests run on emulator.
b/37481239
b/37523523

Change-Id: Ife90a3358b6620c8fb81324ec2331d3775a38191

libwvdrmengine/level3/mips64/Android.mk

@@ -1,11 +0,0 @@
-LOCAL_PATH:= $(call my-dir)
-include $(CLEAR_VARS)
-LOCAL_MODULE := libwvlevel3
-LOCAL_MODULE_CLASS := STATIC_LIBRARIES
-LOCAL_MODULE_SUFFIX := .a
-LOCAL_SRC_FILES := $(LOCAL_MODULE)$(LOCAL_MODULE_SUFFIX)
-LOCAL_PROPRIETARY_MODULE := true
-LOCAL_MODULE_TAGS := optional
-LOCAL_MODULE_OWNER := widevine
-LOCAL_MODULE_TARGET_ARCH := mips64
-include $(BUILD_PREBUILT)