arm64: dts: allwinner: a100: Add syscon nodes

arm64: dts: allwinner: a100: Add syscon nodes

The Allwinner A100 has a system configuration block, denoted as SYS_CFG
in the user manual's memory map. It is undocumented in the manual, but
a glance at the vendor tree shows this block is similar to its
predecessors in the A64 and H6. The A100 also has 3 SRAM blocks: A1, A2,
and C. Add all of these to the SoC's device tree.

Reviewed-by: Parthiban Nallathambi <parthiban@linumiz.com>
Signed-off-by: Cody Eksal <masterr3c0rd@epochal.quest>
Link: https://patch.msgid.link/20241218-a100-syscon-v2-2-dae60b9ce192@epochal.quest
Signed-off-by: Chen-Yu Tsai <wens@csie.org>