misc: qcom: qdsp6v2: use 32-bit variable to store token

Even when we send buffer address with more than 32-bit
to DSP, APR callback handle will return a token with only
32-bit. Hence use a 32-bit variable to store the buffer
address locally, so that comparison between these does
not fail.

Change-Id: I1ce574d57bb7ee2716d112711f6a160bdb6c3e22
Signed-off-by: Banajit Goswami <bgoswami@codeaurora.org>