msm: msm_bus_dbg: do not create dbgfs handles

Remove the portion during probe where we access a list of client owned
memory to create a set of debugfs files in order to prevent
an access after free during boot up. This is resulting from some client
that fails to unregister as part of their probe failure handling after
registering with the bus driver.

Change-Id: I8f30ee09ea409933a1be7abb1748b26616cb7586
Signed-off-by: David Dai <daidavid1@codeaurora.org>