staging: tidspbridge: core code cleanup

Reorganized some code in the core module to increase its
readability. Most of the changes reduce the code
indentation level and simplifiy the code. No functional
changes were done.

Signed-off-by: Ionut Nicu <ionut.nicu@mindbit.ro>
Signed-off-by: Omar Ramirez Luna <omar.ramirez@ti.com>