Revert "posix: device_io: implement pselect()"

This reverts commit 305ec62a6b1fc2aee8ecb1a8c34f09492114ba28.

PR #73978 introduced a regression.
Unfortunately this PR cannot be reverted without reverting also
Let's revert both PRs to stabilize main again towards the 3.7 release.

For more details on the issue see
https://github.com/zephyrproject-rtos/zephyr/issues/75205

Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>
6 files changed