[media] s5p-fimc: Make sure an interrupt is properly requested

Use dev_name() for requesting an interrupt so we don't get an interrupt
requested with same name for multiple device instances.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>