Remove extra layering of HDR capabilities on top of HWC

SurfaceFlinger claimed to always handle HDR10 and HLG content. This was
because initial handling of HDR content was done by hacking in Y410
support and applying a special GPU shader. However, the Y410 path has
not been used since at least Android 12 when SkiaRenderEngine stopped
supporting it.

The resulting side effect is that some WCG-capable devices are reporting
themselves as HDR-capable to apps. This is not desirable by OEMs who may
install a low dynamic range panel. And, on such panels, an SDR rendition
would likely both look better and have cheaper power consumption.

This change allows for OEMs to report that they don't support HDR. Note
that this patch does not change color management: OEMs will still be
required to accept HLG or HDR10 content and color manage correctly if
the display receives this content. I.e., the HdrCapabilities API will
tell the app that they *should not* submit HDR content, not that they
*cannot*.

Bug: 281623165
Test: libcompositionengine_test
Change-Id: I7c7dc150fd92e580330e31f9ebfe29e645510cdf