Revert "Forward port SystemUI: HSPA+ Support"

This reverts commit cf7deeb29eae14194f982b89736afc19ffa5e4ed.
Revert "Do not show Home behind full screen activity"

This reverts commit 94827ce615759766a0fbfa3352b4f7bbd2c5bcfd.
Revert "frameworks/base: Fix the random UI corruption"

This reverts commit 4a34379efbf87b572e93018303c53f44632cfb53.
Revert "Keyguard: fix statusbar lags when default widget shown."

This reverts commit c178caea9a8c1195f3db4bd07f1d2a540b877cd6.