Captivatemtd: Switch back to Semaphore

Change-Id: I39d0768a12bbec299dae9be781c6b1312631e4dd
Signed-off-by: Josue Rivera <prbassplayer@gmail.com>
No longer need common_sgs.mk

Change-Id: I2338e825ed43540783af538847d4c1ab27506c47
Signed-off-by: Josue Rivera <prbassplayer@gmail.com>