pal: do not retry isDeviceReady if stream routing is for combo device

SwitchDevice function requires stream mutex to be locked. If a stream
is active on Speaker and routing comes for combo device, adding retry
loop for 2 secs will block write call on Speaker if A2dp device is not
ready.

Added check to not retry isDeviceReady if stream routing is on combo
device. This will ensure seamless audio over Speaker.

Change-Id: Ia04a7be46babccad54c2fedd76d10eb76bc6a21d
1 file changed