of: unittest-data: Convert remaining overlay DTS files to sugar syntax

Overlay syntactic sugar for generating target-path fragments is
supported by the version of dtc supplied with the kernel since commit
50aafd60 ("scripts/dtc: Update to upstream version
v1.4.6-21-g84e414b0b5bc").  Hence convert the remaining unittest overlay
devicetree source files to sugar syntax, improving readability.

This completes the work started in commit db2f3762 ("of: convert
unittest overlay devicetree source to sugar syntax").
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/9b5991c85e5a2a7cdf33a4e59b42ef98eaadd98a.1690533838.git.geert+renesas@glider.beSigned-off-by: Rob Herring <robh@kernel.org>

drivers/of/unittest-data/overlay_0.dtso

@@ -2,13 +2,8 @@
 /dts-v1/;
 /plugin/;
 
-/ {
-	/* overlay_0 - enable using absolute target path */
+/* overlay_0 - enable using absolute target path */
 
-	fragment@0 {
-		target-path = "/testcase-data/overlay-node/test-bus/test-unittest0";
-		__overlay__ {
+&{/testcase-data/overlay-node/test-bus/test-unittest0} {
 	status = "okay";
-		};
-	};
 };

drivers/of/unittest-data/overlay_1.dtso

@@ -2,13 +2,8 @@
 /dts-v1/;
 /plugin/;
 
-/ {
-	/* overlay_1 - disable using absolute target path */
+/* overlay_1 - disable using absolute target path */
 
-	fragment@0 {
-		target-path = "/testcase-data/overlay-node/test-bus/test-unittest1";
-		__overlay__ {
+&{/testcase-data/overlay-node/test-bus/test-unittest1} {
 	status = "disabled";
-		};
-	};
 };

drivers/of/unittest-data/overlay_12.dtso

@@ -2,13 +2,8 @@
 /dts-v1/;
 /plugin/;
 
-/ {
-	/* overlay_12 - enable using absolute target path (i2c) */
+/* overlay_12 - enable using absolute target path (i2c) */
 
-	fragment@0 {
-		target-path = "/testcase-data/overlay-node/test-bus/i2c-test-bus/test-unittest12";
-		__overlay__ {
+&{/testcase-data/overlay-node/test-bus/i2c-test-bus/test-unittest12} {
 	status = "okay";
-		};
-	};
 };

drivers/of/unittest-data/overlay_13.dtso

@@ -2,13 +2,8 @@
 /dts-v1/;
 /plugin/;
 
-/ {
-	/* overlay_13 - disable using absolute target path (i2c) */
+/* overlay_13 - disable using absolute target path (i2c) */
 
-	fragment@0 {
-		target-path = "/testcase-data/overlay-node/test-bus/i2c-test-bus/test-unittest13";
-		__overlay__ {
+&{/testcase-data/overlay-node/test-bus/i2c-test-bus/test-unittest13} {
 	status = "disabled";
-		};
-	};
 };