Allwinner axp209 attach later

[manu]

Summary

We need aw_nmi to be attached which needs GIC so attach a bit later.
Also the GPIOC doesn't need to be attach early

Test Plan

Tested on Olimex A20 SOM EVB

[andrew]

What other driver needs this?

[manu]

In D7082#148712, @andrew wrote:

What other driver needs this?

If "this" == attach later, None
if "this" == gpio from axp209 for now none, but usbphy will need it on some boards.

[andrew]

I meant this driver, i.e. why does it need to be early to begin with.

[manu]

In D7082#149081, @andrew wrote:

I meant this driver, i.e. why does it need to be early to begin with.

The usb driver will need the gpio interrupts on some boards for the VBUS/ID detect stuff.