cpcap-mapphone: Use the correct supply name for vdds_dsi.

cpcap-minnow indeed needs this to be named vcsi. But they're doing the
initialization different (by using m4sensorhub - which is not available
on mapphone).

Change-Id: I4a98e02b03b73d72e7dad9c6b5c8cc0d9ae050ac
Merge pull request #14 from xdarklight/3.10-defy

cpcap-mapphone: Use the correct supply name for vdds_dsi.