ARM: dt: sun7i: Add A20 SPI controller nodes

The A20 has 4 SPI controllers compatible with the one found in the A10. Add
them in the DT.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
ARM: dt: sun4i: Add A10 SPI controller nodes

The A10 has 4 SPI controllers that are now supported. Add them in the DT.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
ARM: dt: sun5i: Add A10s SPI controller nodes

The A10s has 3 SPI controllers compatible with the one found in the A10. Add
them in the DT.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
ARM: dt: sun5i: Add A13 SPI controller nodes

The A13 has 3 SPI controllers compatible with the one found in the A10. Add
them in the DT.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
ARM: dt: sun7i: Add SPI muxing options

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
ARM: dts: sun7i: Enable the SPI controllers of the A20-olinuxino-micro

The A20-Olinuxino-micro has two SPI bus exposed on its UEXT connectors, enable
them.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>