Port back changes from open_agb_firm. Now with proper screen init.

Use I2C IRQs. I2C code cleanup + other changes required after the former.

Deinit critical hardware before FIRM launch.

Move most inline asm to arm.h.

Use volatile instead of __volatile__.

arm11 power: wait for the screens to turn off during power-off/reboot

Here comes the coding style police!

arm11: use mcu driver

arm11: introduce mcu driver, halt leds during startup

Implemented fs deinit on poweroff/panic/exception.

Little cleanup.

Move GUI sources in a separate gui folder and hardware sources in hardware folder episode 2.

Added license to all sources. Dir structure cleanup.

Refactor of I2C code.

Revert useless changes from a0108e2e.

Clobber the global namespace less.

It's enough to flush the dcache + forgot the reboot function.

Deinit CPU + wait for interrupt on poweroff/reboot.

Give PXI its own IRQ handler.

Split hid.c/h in ARM9/11 versions. HOME/POWER and the WiFi slider can now be read with HID functions.

Do not set all bits for poweroff.

power.c