[media] s5p-fimc: Remove unneeded fields from struct fimc_dev

irq is used only locally and num_clocks is constant, so remove them.

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>