rtos: style corrections for uCOS-III

This patch corrects a number of style infractions in RTOS support for
uC/OS-III. These were missed during initial review last year prior to
the 0.10.0 release.

Change-Id: Ia2139f6ca381d4087fd8ee989f7a03ac474d7440
Signed-off-by: Steven Stallion <stallion@squareup.com>
Reviewed-on: http://openocd.zylin.com/4120


Tested-by: jenkins
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>