dts: arm: xilinx: zynqmp: remove sram0 declaration at SoC level

Remove the universal, unconditional declaration of the RAM area
at the SoC level, due to:

- the hardcoded base address 0 overlapping the exception vectors,
  the ATCM and the BTCM areas.
- the availability of the BTCM not being guaranteed unconditionally
  (config pin dependant)
- the possibility of having a 'black hole' between the ATCM and
  the BTCM depending on the operating mode of the R-cores cluster,
  which leads to a part of the text section being unavailable
- qemu not properly implementing the configuration-dependant
  behaviour of the ATCM and BTCM areas.

Signed-off-by: Immo Birnbaum <[email protected]>

Author: ibirnbaum

dts/arm/xilinx/zynqmp.dtsi

@@ -19,12 +19,6 @@
 			compatible = "soc-nv-flash";
 			reg = <0xc0000000 DT_SIZE_M(32)>;
 		};
-
-		sram0: memory@0 {
-			compatible = "mmio-sram";
-			reg = <0 DT_SIZE_M(64)>;
-		};
-
 		ocm: memory@fffc0000 {
 			compatible = "zephyr,memory-region", "xlnx,zynq-ocm";
 			reg = <0xfffc0000 DT_SIZE_K(256)>;