Revert "Bluetooth: Host: Check encryption level for EATT channels"
Revert "Bluetooth: Host: Check encryption level for EATT channels"

This reverts commit f3444ce00b649410d6e4a4004e86ebdb6881cb63.
The check is not needed anymore, as the EATT channels are available on
encrypted link only.

Signed-off-by: Mariusz Skamra <c73850bd0bf85e95dce44c2ce1418ca55c1b6c5d@codecoup.pl>

finikorg/zephyr,finikorg/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,finikorg/zephyr,finikorg/zephyr,galak/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr