at91: fix devicetree warnings

This commit fixes various devicetree warnings in the at91 devicetrees
like:
arch/arm/dts/sama5d36ek_cmp.dtb: Warning (avoid_unnecessary_addr_size): /gpio_keys: unnecessary #address-cells/#size-cells without "ranges" or child "reg" property

These warnings make buildman report failed builds for most of at91 boards.
Thus, fixing it.

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
12 files changed