media: atomisp: Remove double atomisp_mrfld_power_down()/_up() calls from atomisp_reset()

atomisp_reset() calls atomisp_mrfld_power_down() after calling
atomisp_runtime_suspend(), which already calls
atomisp_mrfld_power_down() itself.

And the some goes for atomisp_runtime_resume() / atomisp_mrfld_power_up().

Reviewed-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>