sunxi: DT: R40: Update device tree files from Linux 5.12

Update R40 .dts{,i} and dt-binding headers to current version from kernel.

Files taken from Linux 5.12-rc1 release
(commit fe07bfda2fb9cdef8a4d4008a409bb02f35f1bd8)

Signed-off-by: Ivan Uvarov <i.uvarov@cognitivepilot.com>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>