drm_hwcomposer: add missing HAL pixel format

using Android-11 (android-11.0.0_r27 )on i500 MediaTek SoC we can
see some log floods with the following trace:

E hwc-platform-drm-generic: Cannot convert hal format to drm format 43

Adding the conversion of this format : HAL_PIXEL_FORMAT_RGBA_1010102
resolves the log flood

Signed-off-by: Riadh Ghaddab <rghaddab@baylibre.com>
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