ARM: davinci: devices-da8xx: Clean up and correct the McASP device creation

Both DA830 and DA850 has McASP0 module, so do not restrict the use of
McASP0 for da850 only.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>