CC3301: cc33xx driver probe

The firmware gets automatically downloaded so the user does not need to load it manually. For a reference of the device tree, see below:

&sdhci2 {
	status = "okay";
    bootph-all;
	vmmc-supply = <&wlan_en>;
	pinctrl-names = "default";
	pinctrl-0 = <&main_mmc2_pins_default>;
	bus-width = <4>;
	non-removable;
	ti,fails-without-test-cd;
	cap-power-off-card;
	keep-power-in-suspend;
	ti,driver-strength-ohm = <50>;

	#address-cells = <1>;
	#size-cells = <0>;
	wlcore: wlcore@2 {
		compatible = "ti,cc3301";
		reg = <2>;
		pinctrl-names = "default";
		pinctrl-0 = <&main_wlirq_pins_default>;
		interrupt-parent = <&main_gpio0>;
		interrupts = <72 IRQ_TYPE_EDGE_FALLING>;
	};
};