msm: kgsl: Put refcount to node and child after use

adreno_coresight_init do not put ref count to node
after use and child pointer ref count is not getting
put in error handling scenarios. Properly put ref
count of node and child.

Change-Id: I87c190c0eb5cb5ae164fa8a94d73737bd212736d
Signed-off-by: Prakash Kamliya <pkamliya@codeaurora.org>