V4L/DVB: vpfe-capture: converting dm644x ccdc driver to a platform driver

1) clocks are configured using generic clock names
2) converting the driver to a platform driver
3) cleanup - consolidate all static variables inside a structure, ccdc_cfg

The ccdc driver now uses generic names for clocks - master and slave. On individual platforms
these clocks will inherit from the platform specific clock. This will allow re-use of
the driver for the same IP across different SoCs.

Reviewed-by: Kevin Hilman <khilman@deeprootsystems.com>
Reviewed-by: Vaibhav Hiremath <hvaibhav@ti.com>
Reviewed-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Muralidharan Karicheri <m-karicheri2@ti.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>