usb:hsotg:samsung: err_irq: support for probe function

Missing handler for freeing requested IRQ added.
Moreover clk_ calls has been reorganized.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>