USB: pd: Fix compilation issues for 32 bit support

Compilation errors are seen from policy_engine.c driver,
when try to compile for 32 bit support. Hence fix those
errors for 32 bit support getting compiled successfully.

Change-Id: Id891d5ebcfbb85c1515c2aa60b192264b7a20db0
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>