misc: qcom: qdsp6v2: correct validation check for asfpacketlength

Input validation check for asfpacketlength is not correct as range
of variable should be greater than 0 and less than max value.

Change-Id: Ie4e0991518a01d63fb65e5b589c01f213af68743
Signed-off-by: Ramjee Singh <ramjee@codeaurora.org>