qseecom: Remove extra call to disable clock.

Currently the qseecom driver calls qsee_disable_clock_vote() in
the release function. This reduces the reference count during
disabling of the clock and results in turning off the bus clocks
inconsistently.
This change fixes the inconsistency.

Change-Id: I33aa90744a65a3e1a9aba0c368de99ef61a35073
Signed-off-by: Ramesh Masavarapu <rameshm@codeaurora.org>