soc: sunxi: sram: Remove unused list 'claimed_sram'

The list 'claimed_sram' seems unused, as far as I can tell it always
has been.
I think the 'list' member of sunxi_sram_data was intended to be
used when it was on that list.
Remove them.

Build tested only.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Link: https://lore.kernel.org/r/20240504204401.198913-1-linux@treblig.org


Signed-off-by: Chen-Yu Tsai <wens@csie.org>