Add patches to full support "Raspberry PI W2 2021".

[denisandroid]

Previously, "Archlinux ARM" images worked fine with your library and identified themselves correctly. With the advent of a distribution update, the operation of your library was disrupted.

According to the new changes to the device tree, devices now identify themselves as "raspberry pi,model-zero-2-w" and there is only one option in your library: "raspberry pi,model-zero-2". (see current rpios dts file)

Also, here's some debugging:

new_archarm current (0.15.0, Archlinux ARM, W2 2021):
[src/model.rs:173] &hardware[..] = ""
[src/model.rs:174] &revision[..] = "902120"
[src/model.rs:244] comp_id = "raspberrypi,model-zero-2-w"
[src/model.rs:244] comp_id = "brcm,bcm2837"
[src/model.rs:244] comp_id = ""
[src/model.rs:292] &base_model = "Raspberry Pi Zero 2 W Rev 1.0"
[src/model.rs:304] &base_model[..] = "Raspberry Pi Zero 2 W"
cdevice: Err(UnknownModel) <<

old_archarm (0.15.0, Archlinux ARM, W2 2021):
[src/model.rs:173] &hardware[..] = "BCM2835"
[src/model.rs:174] &revision[..] = "902120"
[src/model.rs:205] revision_type = 18
cdevice: Ok(DeviceInfo { model: RaspberryPiZero2W, soc: Bcm2837A1, peripheral_base: 1056964608, gpio_offset: 2097152, gpio_lines: 54, gpio_interface: Bcm }) <<

current (0.15.0, Archlinux ARM, RPI3):
[src/model.rs:173] &hardware[..] = ""
[src/model.rs:174] &revision[..] = "a02082"
[src/model.rs:244] comp_id = "raspberrypi,3-model-b"
cdevice: Ok(DeviceInfo { model: RaspberryPi3B, soc: Bcm2837A1, peripheral_base: 1056964608, gpio_offset: 2097152, gpio_lines: 54, gpio_interface: Bcm })

next (my_fork, Archlinux ARM, W2 2021):
[src/model.rs:173] &hardware[..] = ""
[src/model.rs:174] &revision[..] = "902120"
[src/model.rs:244] comp_id = "raspberrypi,model-zero-2-w"
[src/model.rs:244] comp_id = "brcm,bcm2837"
[src/model.rs:244] comp_id = ""
[src/model.rs:293] &base_model = "Raspberry Pi Zero 2 W Rev 1.0"
[src/model.rs:305] &base_model[..] = "Raspberry Pi Zero 2 W"
cdevice: Ok(DeviceInfo { model: RaspberryPiZero2W, soc: Bcm2837A1, peripheral_base: 1056964608, gpio_offset: 2097152, gpio_lines: 54, gpio_interface: Bcm })

[golemparts]

Thanks for the PR! It's good to see the alternative identification functions are still useful for other distros.