hybris: remove (MR 1529)

Libhybris is failing to build for armhf too. Instead of adding !armhf
everywhere, let's just remove it: as it became clear in #703, nobody is
willing to put in the effort to maintain this properly.

If you would like to continue with libhybris on postmarketOS, please
create your own aports repository and put the aports there.

Related: https://wiki.postmarketos.org/wiki/Hybris
Closes: #703, #700, #678
(cherry picked from commit e1a3324e)