msm: ipa3: Fix to copy num of rules from user space

Changes done to copy num of rules from user space to
kernel side as earlier only payload was being copied.
And it is needed to check if user space payload is
not modified in between.

Change-Id: I14e15fe0c6746226cc44d224d33c00e809cd69ca
Signed-off-by: Armaan Siddiqui <asiddiqu@codeaurora.org>