Description of the feature or fix

Added definition of ARGB8565.
Change bpp of RGB565A8 to 16.

For RGB565A8, both 24 and 16 are wrong, 16 is slightly better because that alpha stride is calculated based on map stride which can use 16 as bpp.

Software renderer does not support ARGB8565 yet. Some of the GPU like VG-Lite can support it.
Need to upgrade python image converter script and VG-Lite porting code.

Notes

• Update the Documentation if needed.
• Add Examples if relevant.
• Add Tests if applicable.
• If you added new options to lv_conf_template.h run lv_conf_internal_gen.py and update Kconfig.
• Run scripts/code-format.py (astyle needs to be installed) and follow the Code Conventions
• Mark the Pull request as Draft while you are working on the first version, and mark is as Ready when it's ready for review.
• When changes were requested, re-request review to notify the maintainers.
• Help us to review this Pull Request! Anyone can approve or request changes.