soc: microchip: mpfs: fix some horrible alignment

mpfs_sys_controller_delete() has some horrible alignment that upsets my
OCD... Move the RHS of the assignment to a new line for greater
satifaction.

Tested-by: Valentina Fernandez <valentina.fernandezalanis@microchip.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>