ASoC: Maxim98090: Use PLL locking delays as specified in datasheet

Lock and wait for 2ms as specified in maxim datasheet.
Remove build warning.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
ASoC: Intel: make sure we check for valid stream before getting position

It looks like any delayed IPC responses after stream closure are causing
the driver to check position with an NULL stream pointer. Not observed at
my end, but debugged by stack trace.


Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>