staging: tidspbridge: rmgr/node.c code cleanup

Reorganized some code in rmgr/node.c 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>