pinctrl: bcm2835: Persist outputs by default

Having accepted the upstream change to add the persist_gpio_outputs
parameter, make it true by default.

See: #6117

Signed-off-by: Phil Elwell <phil@raspberrypi.com>

drivers/pinctrl/bcm/pinctrl-bcm2835.c

@@ -244,7 +244,7 @@ static const char * const irq_type_names[] = {
 	[IRQ_TYPE_LEVEL_LOW] = "level-low",
 };
 
-static bool persist_gpio_outputs;
+static bool persist_gpio_outputs = true;
 module_param(persist_gpio_outputs, bool, 0644);
 MODULE_PARM_DESC(persist_gpio_outputs, "Enable GPIO_OUT persistence when pin is freed");