MAINTAINERS: update maintainer entry for pxa/hx4700

Add Paul Parsons as maintainer for pxa/hx4700.
Also, add a mailing list and update the files.

Signed-off-by: Philipp Zabel <[email protected]>
Acked-by: Paul Parsons <[email protected]>
Signed-off-by: Haojian Zhuang <[email protected]>
1 file changed