Added format for ColorTransform matrix

ColorTransform is a 4x4 matrix so formated the values to be more
readable.

Also changed code where determines if the buffer is null to check if the
layer type is BufferStateLayer or BufferQueueLayer

Test: go/winscope with color transform
Change-Id: Ief46f2f3260e0736ffced8c233ab375e162d4228
2 files changed