media: imx: imx7_mipi_csis: Drop unused csis_hw_reset structure

The csis_hw_reset structure is instantiated as a member of csi_state,
but that member is never used. Drop it.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Rui Miguel Silva <rmfrfs@gmail.com>
Tested-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>