Audio: fix ~refbase() crash caused by race condition

[cause]：When ~SuspendedEffectDesc() is called, mSuspendedEffects race condition cause strong refcount of SuspendedEffectDesc obj is 1, which causing a fatal error.
[example]:
    1. thread1:
	AudioFlinger::setEffectSuspended
		|-> ThreadBase::setEffectSuspended_l
			|-> EffectChain::setEffectSuspended_l
				|-> ~SuspendedEffectDesc
					|-> ~RefBase
    2. thread2:
	EffectChain::EffectCallback::onEffectDisable
		|-> EffectCallback::checkSuspendOnEffectEnabled
			|-> EffectChain::checkSuspendOnEffectEnabled_l
				|-> incStrong
[solution]：add mutex for mSuspendedEffects

Flag: EXEMPT bugfix
Bug: 408017789
Test: atest CtsMediaAudioTestCases
Change-Id: I344747a4f2cd5ea7620ce74f11625926a23f178a
Signed-off-by: zhouchenchang <zhouchenchang@xiaomi.com>