drivers: mcxc osc: use oscillator internal capacitance value from DT

Use default value 0 if board DT doesn't define it.e
It's totally fine if the board device tree doen't define
load_capacitance_picofarads for the crystal oscillator. In that case,
just fallback to 0.

Signed-off-by: jens rudberg <jens@teenage.engineering>

Author: jrte-dev

soc/nxp/mcx/mcxc/soc.c

@@ -68,7 +68,7 @@ const sim_clock_config_t simConfig_BOARD_BootClockRUN = {
 
 const osc_config_t oscConfig_BOARD_BootClockRUN = {
 	.freq = DT_PROP(OSC_NODE, clock_frequency),
-	.capLoad = 0,
+	.capLoad = DT_PROP_OR(OSC_NODE, load_capacitance_picofarads, 0),
 #if DT_ENUM_HAS_VALUE(OSC_NODE, mode, external)
 	.workMode = kOSC_ModeExt,
 #elif DT_ENUM_HAS_VALUE(OSC_NODE, mode, low_power)