FW_BASE: Rewrite restart SystemUI method

Original commit: https://github.com/VelvetProject/packages_apps_ThemeInterfacer/commit/3484db3dda1e7bf7e3f6fda049b903968f1506e7)

AICPfy:
- Clean up unrequired code from previous implementation: https://github.com/AICP/frameworks_base/commit/d4d72acdc931d24a620911dbf5527c45244310c0
- In fw_base, we can use the classes directly

Change-Id: I2cc98647138840ee0863c89126948465c634a570
Signed-off-by: Varun Date <date.varun123@gmail.com>
6 files changed