msm: tspp: Request IRQs on first use

Reserving the IRQs on driver initialization is redundant and should
be done only when client first uses the driver. Also, it may prevent
transition to power saving modes.
Move IRQ requests to be done when first stream is opened, and free
when last stream is closed.

Change-Id: I7147335aa51e047df8b173a05e057f77dc1c4894
Signed-off-by: Gilad Broner <gbroner@codeaurora.org>