Revert "Reset UART on deinit, reduces power consumption" (from #8089)

This reverts commit ec1e7a0.

Author: dhalbert

ports/nrf/common-hal/busio/UART.c

@@ -266,15 +266,8 @@ bool common_hal_busio_uart_deinited(busio_uart_obj_t *self) {
 }
 
 void common_hal_busio_uart_deinit(busio_uart_obj_t *self) {
-    volatile uint32_t *power_cycle = (void*)(self->uarte->p_reg) + 0xFFC;
     if (!common_hal_busio_uart_deinited(self)) {
-        nrfx_uarte_rx_abort(self->uarte);
-        nrfx_uarte_tx_abort(self->uarte);
         nrfx_uarte_uninit(self->uarte);
-        // power cycle the peripheral as per https://devzone.nordicsemi.com/f/nordic-q-a/26030/how-to-reach-nrf52840-uarte-current-supply-specification/102605#102605
-        *power_cycle = 0;
-        *power_cycle;
-        *power_cycle = 1;
         reset_pin_number(self->tx_pin_number);
         reset_pin_number(self->rx_pin_number);
         reset_pin_number(self->rts_pin_number);