dt-bindings: sram: sunxi-sram: Add H616 SRAM regions

dt-bindings: sram: sunxi-sram: Add H616 SRAM regions

The Allwinner H616 has two switchable peripheral SRAM regions:

- The VE SRAM is a 2 MB dedicated SRAM for the Video Engine. CPU access
  to this region is enabled by default. CPU access can be disabled,
  after which reads will show the same stale value for all addresses,
  while writes are ignored.

  The mux value for this region is different from previous generations.

- The SRAM C region is an alias of the first 128 KB of VE SRAM, plus 64
  KB of DE SRAM. The latter is otherwise unaccessible from the CPU. When
  CPU access is disabled, the whole region reads as zero, while writes
  are ignored.

  The mux value for this region is the same as on the A64 and H6.

Add compatible strings for both of them.

Acked-by: Rob Herring (Arm) <robh@kernel.org>
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://patch.msgid.link/20260324164357.1607247-3-wens@kernel.org
Signed-off-by: Chen-Yu Tsai <wens@kernel.org>