dcmipp: allow PIPE_SetConfig when pipe state is READY

Allow to call HAL_DCMIPP_PIPE_SetConfig when the pipe state
is READY. Currently it is only possible to use this function
if the pipe state is RESET and ERROR states.
Indeed, it is possible to reconfigure the PIPE as soon as the
pipe is not currently being used, aka in the READY state.
With that done, it becomes possible to change the PIPE
configuration between two use-cases without having to
DeInit / Init the HAL_DCMIPP or use the unitary pixel packer
functions.

Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>