Set Portenta core vbat to 3.0v
#define OMV_OSC_PLL1FRAC (0)
// Core VBAT for selftests
-#define OMV_CORE_VBAT "3.3"
+#define OMV_CORE_VBAT "3.0"
// PLL2 180MHz for FMC and QSPI.
#define OMV_OSC_PLL2M (3)
