diag: Do not wait for the intent availability indefinetly

While sending data to WDSP do not wait for the intent to be available
for ever so that diag is not blocked to send data to other peripherals.

Change-Id: I5e410ebabf4e8066abedda147879444a38b8871b
Signed-off-by: Sreelakshmi Gownipalli <sgownipa@codeaurora.org>