Prevent MediaPlayerService::Client's use-after-free

Test: make cts -j123 && cts-tradefed run cts-dev -m \
CtsMediaTestCases --compatibility:module-arg \
CtsMediaTestCases:include-annotation:\
android.platform.test.annotations.RequiresDevice

Bug: 70546581
Merged-In: Ia142a7735c6685eb67b2c00917c0ed5ea7e0da9e
Change-Id: Ia142a7735c6685eb67b2c00917c0ed5ea7e0da9e
(cherry picked from commit d27ad6bae3215db0ed174f5f036339c9515fbba7)
(cherry picked from commit 028cf0973f928503e89124c3f6493a5226826ed9)
5 files changed