Michal Meloun 7f8c4c78f5 Add method for getting of syscon handle from parent device.
If simple multifuction device also provides syscon interface, its
childern should be able to consume it. Due to this:
- declare coresponding method in syscon interface
- implement it in simple multifunction device driver

MFC after:	1 week
2019-08-18 08:08:56 +00:00
..
2019-08-10 18:50:37 +00:00