snippets: nordic-flpr: move vevif enablement to nRF54L15DK overlay

Other platforms using FLPR, e.g. nRF54H20 do not need this.

Signed-off-by: Gerard Marull-Paretas <gerard@teslabs.com>

snippets/nordic-flpr/boards/nrf54l15pdk_nrf54l15_cpuapp.overlay

@@ -37,3 +37,7 @@
 	execution-memory = <&cpuflpr_sram_code_data>;
 	source-memory = <&cpuflpr_code_partition>;
 };
+
+&cpuapp_vevif_tx {
+	status = "okay";
+};

snippets/nordic-flpr/nordic-flpr.overlay

@@ -6,7 +6,3 @@
 &cpuflpr_vpr {
 	status = "okay";
 };
-
-&cpuapp_vevif_tx {
-	status = "okay";
-};