msm ipa3: fix blocking faulty IOCTLs

This change prevents blocking IOCTLs with wrong command
number or wrong magic Number. IOCTL handler should first
check that the command is valid and only then wait for
IPA driver initializations to finish.

CRs-Fixed: 1094653
Signed-off-by: Amir Levy <alevy@codeaurora.org>
Change-Id: I578dc96da96f7c10be51eac1f8b3c190e45dcfcf