pbio/drv/uart/uart_ev3_pru_lib/suart_api.c: Remove PRU1 support

At this point, we are more-or-less committed to running our own firmware on PRU1.
This means that we cannot use it for SUART instances. Remove support for
running SUART across both PRUs in order to simplify the code and make it
easier to understand.

Author: ArcaneNibble

lib/pbio/drv/uart/uart_ev3_pru_lib/pru.c

@@ -129,19 +129,6 @@ uint32_t pru_disable(arm_pru_iomap *pru_arm_iomap) {
         hPru->CONTROL = CSL_PRUCORE_CONTROL_RESETVAL;
     }
 
-    // Disable PRU1
-    hPru = (CSL_PrucoreRegsOvly)((uint32_t)pru_arm_iomap->pru_io_addr + 0x7800);        // CSL_PRUCORE_1_REGS;
-    CSL_FINST(hPru->CONTROL, PRUCORE_CONTROL_COUNTENABLE, DISABLE);
-
-    for (delay_cnt = 0x10000; delay_cnt > 0; delay_cnt--) {
-        CSL_FINST(hPru->CONTROL, PRUCORE_CONTROL_ENABLE, DISABLE);
-    }
-
-    for (delay_cnt = 0x10000; delay_cnt > 0; delay_cnt--) {
-        // Reset PRU1
-        hPru->CONTROL = CSL_PRUCORE_CONTROL_RESETVAL;
-    }
-
     return E_PASS;
 }