SetupWizard: Conditionally run account setup

If the package defined by cm_account_type (which can be overlayed)
exists, then add CyanogenSettingsPage. Otherwise, omit.

PS3: On the cyngn side, the account type and package name don't match. Added a new string to overlay.

Change-Id: I15e032e21281aaf51ca32ac9cc0861e033201f19
(cherry picked from commit 7ab7f3c6)