mfd: twl-core: Fix clock initialization

mfd: twl-core: Fix clock initialization

BugLink: http://bugs.launchpad.net/bugs/1807469
commit c218b3b242bd04539621b468f01ecd2af5a21a45 upstream.

When looking up the clock we must use the client->dev as device since that
is the one which is probed via DT.

Cc: stable@vger.kernel.org # 4.16+
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>