ARM: dts: sun5i: Add support for the C1 SRAM region with the SRAM controller

This adds support for the C1 SRAM region (to be used with the SRAM
controller driver) for sun5i-based platforms. The region is shared
between the Video Engine and the CPU.

Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
[Maxime: Fixed the SRAM C size to take the C2 and C3 SRAM into account]
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>