media: vimc: fix kernel-doc markups

media: vimc: fix kernel-doc markups

There are several markups there that doesn't follow the
specs. Fields should be like:

	@foo:

with a collon at the end. Also, continuation lines should
be aligned.

Failing to do that would cause kernel-doc to parse it wrong.
Some of the troubles will even cause warnings:

	$ ./scripts/kernel-doc -none drivers/media/test_drivers/vimc/vimc-common.h
	drivers/media/test_drivers/vimc/vimc-common.h:59: error: Cannot parse struct or union!
	drivers/media/test_drivers/vimc/vimc-common.h:77: warning: Function parameter or member 'bpp' not described in 'vimc_pix_map'
	drivers/media/test_drivers/vimc/vimc-common.h:120: warning: Function parameter or member 'pipe_cfg' not described in 'vimc_device'
	drivers/media/test_drivers/vimc/vimc-common.h:120: warning: Function parameter or member 'ent_devs' not described in 'vimc_device'
	drivers/media/test_drivers/vimc/vimc-common.h:120: warning: Function parameter or member 'mdev' not described in 'vimc_device'
	drivers/media/test_drivers/vimc/vimc-common.h:120: warning: Function parameter or member 'v4l2_dev' not described in 'vimc_device'
	drivers/media/test_drivers/vimc/vimc-common.h:137: warning: Function parameter or member 'add' not described in 'vimc_ent_type'
	drivers/media/test_drivers/vimc/vimc-common.h:137: warning: Function parameter or member 'unregister' not described in 'vimc_ent_type'
	drivers/media/test_drivers/vimc/vimc-common.h:137: warning: Function parameter or member 'release' not described in 'vimc_ent_type'
	drivers/media/test_drivers/vimc/vimc-common.h:150: warning: Function parameter or member 'name' not described in 'vimc_ent_config'
	drivers/media/test_drivers/vimc/vimc-common.h:150: warning: Function parameter or member 'type' not described in 'vimc_ent_config'
	drivers/media/test_drivers/vimc/vimc-common.h:197: warning: bad line:                 flags of the pads

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>