dt-bindings: dma: cleanup examples - indentation, lowercase hex

Cleanup examples:
 - use 4-space indentation (for cases when it is neither 4 not 2 space),
 - use lowercase hex,
 - drop unused node's label.
Signed-off-by: NKrzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: NRob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230124081117.31186-2-krzysztof.kozlowski@linaro.orgSigned-off-by: NVinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml

@@ -116,7 +116,7 @@ examples:
     #include <dt-bindings/interrupt-controller/arm-gic.h>
     #include <dt-bindings/interrupt-controller/irq.h>
     /* example with snps,dw-axi-dmac */
-     dmac: dma-controller@80000 {
+    dma-controller@80000 {
         compatible = "snps,axi-dma-1.01a";
         reg = <0x80000 0x400>;
         clocks = <&core_clk>, <&cfgr_clk>;

Documentation/devicetree/bindings/dma/stericsson,dma40.yaml

@@ -147,9 +147,9 @@ examples:
     #include <dt-bindings/interrupt-controller/irq.h>
     #include <dt-bindings/interrupt-controller/arm-gic.h>
     #include <dt-bindings/mfd/dbx500-prcmu.h>
-    dma-controller@801C0000 {
+    dma-controller@801c0000 {
         compatible = "stericsson,db8500-dma40", "stericsson,dma40";
-      reg = <0x801C0000 0x1000>, <0x40010000 0x800>;
+        reg = <0x801c0000 0x1000>, <0x40010000 0x800>;
         reg-names = "base", "lcpa";
         interrupts = <GIC_SPI 25 IRQ_TYPE_LEVEL_HIGH>;
         #dma-cells = <3>;