linux-phytec-fsl

ARM: at91: Remove poweroff code

Now that all the SoC have been converted to use the new poweroff driver, we can
remove the poweroff code defined in mach-at91.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>