set REGOUT0 only when value is erased to default

this fixes reboot loop when REGOUT0 is explicitly set to different value that cannot be rewritten by clearing bits in flash

Author: fanoush

src/boards/boards.c

@@ -111,7 +111,7 @@ void board_init(void) {
   //     #define UICR_REGOUT0_VALUE UICR_REGOUT0_VOUT_3V3
   // in board.h when using that power configuration.
 #ifdef UICR_REGOUT0_VALUE
-  if ((NRF_UICR->REGOUT0 & UICR_REGOUT0_VOUT_Msk) != (UICR_REGOUT0_VALUE << UICR_REGOUT0_VOUT_Pos)){
+  if ((NRF_UICR->REGOUT0 & UICR_REGOUT0_VOUT_Msk) == (UICR_REGOUT0_VOUT_DEFAULT << UICR_REGOUT0_VOUT_Pos)){
     NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Wen << NVMC_CONFIG_WEN_Pos;
     while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}
     NRF_UICR->REGOUT0 = (NRF_UICR->REGOUT0 & ~((uint32_t)UICR_REGOUT0_VOUT_Msk)) |