feat(refr): add backward compatibility for LV_COLOR_16_SWAP

[kisvegabor]

fixes #6104

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[XuNeo]

Thank you Gabor. Should we also add LV_COLOR_16_SWAP option to lv_conf.h and Kconfig?

[PGNetHun]

Thanks. Will it remain in future too?

[kisvegabor]

Should we also add LV_COLOR_16_SWAP option to lv_conf.h and Kconfig?

My understanding was the goals of this update is to make previous drivers and configs work with v9 too. In light of that, I wouldn't add it the config files in v9 because this way people probably will start using it again. If it's really needed the users can add it manually (or it will be picked up from the old configs) What do you think?

Thanks. Will it remain in future too?

We can leave it for a major versions. Maybe adding a #warning could be useful too.

[kisvegabor]

Merging it now. @XuNeo let me know you think we need to do more with it.