soc: qcom: dfc: Correct element size of query response

The mismatched type was causing write beyond struct boundaries
in some cases.

CRs-Fixed: 2357533
Change-Id: Ib979333c4bc7332b1859487a1dbd54967716ee84
Acked-by: Ning Cai <ncai@qti.qualcomm.com>
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>