msm: smp2p: Use the same data type for both parameters for min()

The min macro expects both parameters to be of the type.

Ensure all uses of min convert the parameters to a common type.

Change-Id: I90412df53a5e6fc1179c549d911b6ca54e84f6bb
Signed-off-by: Jeffrey Hugo <jhugo@codeaurora.org>