Revert "boards: arm: Fix sensor shell sample for beagleconnect_freedom board"

This reverts commit 3769938e.

Now that gpio_i2c_switch is upstream, this hack should be removed. This
had the unintended effect of disabling the on-board sensors. The issue
was that the board was merged before this driver was upstream, resulting
in the issue this commit "fixed".

This revert also does not move the bus driver under the controller used
by the driver as the sensor bus I2C driver is not an I2C peripheral.

See:
* https://github.com/zephyrproject-rtos/zephyr/pull/64881
* https://github.com/zephyrproject-rtos/zephyr/pull/64693
* https://github.com/zephyrproject-rtos/zephyr/pull/65031



Signed-off-by: Jason Kridner <jkridner@beagleboard.org>