[SurfaceFlinger] Add methods for setting legacy starution matrix.

This patch adds methods for setting legacy saturation matrix for legacy sRGB
content. Previously it was combined into the color transform matrix which was
applied right before applying OETF, however, we want to apply the legacy
staturation matrix right after applying EOTF.

BUG: 78891890
Test: build
Change-Id: I7709eab0857822e48c49237d6681f6e337b4d29e