hwc: Fix fps calculation.

Fps is returned directly by the driver. No need of additional calculations.

Change-Id: I17bed4347f094b71340ca39e37b66fbcf9fdba9c
fb: Remove extra PUT_VSCREENINFO call.

Remove the extra PUT call during system startup.

Change-Id: I29287af2ee5610e749ac481c2832f41d7381ca59
gralloc: Extend metadata check with MSMFB_METADATA_SET

Not all kernels supporting vsync has MSMFB_METADATA_SET

Change-Id: I97bccbd9fef45b0a00f37e37c81303dcea3dfb72
hwc: few updates

Change-Id: I1aa0dfed8e7b8bf0ca3aed091d0b341735d6e771