audio-hal: Add property for timecheck timeout duration.

Timecheck timeout set to 20sec based on the property
vendor.audio.hal.boot.timeout.ms before system is ready.
It updates to default timeout of 5sec once the system
is ready.
Add this property to PRODUCT_PROPERTY_OVERRIDES

Change-Id: I2987b8af09c40a5fbe292135734d93c597c99c3c