portenta_h7: fix dangerous misconfiguration

Selecting the wrong power scheme could potentially destroy the board.
Luckily, the bit can only be set once and the default build still
uses the Arduino bootloader (which has the correct setting).

Signed-off-by: Martino Facchin <[email protected]>

Author: facchinm

boards/arduino/portenta_h7/arduino_portenta_h7_stm32h747xx_m7_defconfig

@@ -2,7 +2,7 @@
 # SPDX-License-Identifier: Apache-2.0
 
 # Enable the internal SMPS regulator
-CONFIG_POWER_SUPPLY_DIRECT_SMPS=y
+CONFIG_POWER_SUPPLY_SMPS_1V8_SUPPLIES_LDO=y
 
 # Enable GPIO
 CONFIG_GPIO=y