sde: Fix horizontal total and active values for split device

1. Horizontal total value should consider horizontal blanking of each
panel on a device with split panels.
2. Pipe bandwidth calculation is with respect to a panel. On a device
with split panels, horizontal active should be the left split value,
read from MDP driver.

Change-Id: I0f8a70091fe5dd16127d79226a718f5e87f20bf0
3 files changed