Update imx platform to not rely on undefined overflow behaviour

This consists of ensuring that the left operand of each shift is
unsigned when the operation might overflow into the sign bit.

Change-Id: Ia0a10b4a30e63c0cbf1d0f8dfe5768e0a93ae1c7
Signed-off-by: Justin Chadwell <justin.chadwell@arm.com>
1 file changed