Add non hwfb filtering to generic drm importer and LCD panel support

Merged Mykhailo Sopiha requested to merge Mykhailo/drm-hwcomposer:add_imagination_support into master

This merge request is about adding additional filtering option to generic drm importer, and adding LCD panel.

I have finished the effort around adjusting IMG handle from the internal type to gralloc_handle_t.

As was noticed - additional filtering of non hwfb handles can be required for generic drm importer. This option was added so that the default behavior is not changed unless hwc.drm.exclude_non_hwfb_imports option is set to non-zero value.

LCD panel (represented as DRM_MODE_CONNECTOR_DPI) was added for Texas Instruments LCD boards support.

Edited by Mykhailo Sopiha

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