ASoC: msm: qdsp6v2: extend validation of virtual address

Validate a buffer virtual address is fully within the region for an
extended edge case.

CRs-Fixed: 2049911
Signed-off-by: Siena Richard <sienar@codeaurora.org>
Change-Id: I4c56fdd42336d00a2294a8b7cc17c74606e56be2