msm: qdsp5: Modify check in voice memo process rpc request

Packet size of callback data is currently checked against frame size
corresponding to 20msec data. There are instances where 200msec data
is sent to apps corresponding to total record buffer size. In such
cases, the added condition fails and no recording happens causing
voice memo recording to fail.
Modify condition to check against record buffer size instead of
frame size to avoid such failure cases.

CRs-Fixed: 377529
Change-Id: I77bab73a34d95e823f14f3750550a793540248d1
Signed-off-by: Chaithanya Krishna Bacharaju <chaithan@codeaurora.org>