Tegra194: se: fix multiple MISRA issues

This patch fixes violations for the following MISRA rules

* Rule 8.4  "A compatible declaration shall be visible when an object or
             function with external linkage is defined"
* Rule 10.1 "Operands shall not be of an inappropriate essential type"
* Rule 10.6 "Both operands of an operator in which the usual arithmetic
             conversions are perdormed shall have the same essential type
             category"
* Rule 17.7 "The value returned by a function having non-void return
             type shall be used"

Change-Id: I171ac8340de729fd7be928fa0c0694e9bb8569f0
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>