drm_hwcomposer: Fix HwcDisplay::GetDisplayIdentificationData()
Return Error::Unsupported in headless mode and if no EDID blob returned by the kernel.
With this change GraphicsComposerHidlTest#GetDisplayIdentificationData VTS no longer fails.
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Return Error::Unsupported in headless mode and if no EDID blob returned by the kernel.
With this change GraphicsComposerHidlTest#GetDisplayIdentificationData VTS no longer fails.