msm: ultrasound: add verifications of some input parameters

Some security vulnerabilities were found.
To fix them, additional verifications of some input parameters
are required.

CRs-Fixed: 554575, 554560, 555030
Change-Id: Ie87a433bcda89c3e462cfd511c168e8306056020
Signed-off-by: Baruch Eruchimovitch <baruche@codeaurora.org>