applications: nrf_desktop: Align RRAM configuration for nRF54L15 PDK

Change aligns RRAM configuration for nRF54L15 PDK. The application does
not use cpuflpr core, so whole memory can be used by cpuapp.

Jira: NCSDK-27508

Signed-off-by: Marek Pieta <Marek.Pieta@nordicsemi.no>

Author: MarekPieta

applications/nrf_desktop/configuration/nrf54l15pdk_nrf54l15_cpuapp/boards/nrf54l15pdk_nrf54l15_cpuapp_0_2_1.overlay

@@ -9,6 +9,11 @@
 	status = "okay";
 };
 
+/* Application does not use cpuflpr core. Assign whole RRAM to cpuapp. */
+&cpuapp_rram {
+	reg = < 0x0 DT_SIZE_K(1524) >;
+};
+
 / {
 	/* Disable pwmleds and redefine them to align configuration with CAF LEDs requirements.
 	 * The configuration needs to match the used board revision (v0.2.0).

applications/nrf_desktop/configuration/nrf54l15pdk_nrf54l15_cpuapp/boards/nrf54l15pdk_nrf54l15_cpuapp_0_3_0.overlay

@@ -11,6 +11,11 @@
 	status = "okay";
 };
 
+/* Application does not use cpuflpr core. Assign whole RRAM to cpuapp. */
+&cpuapp_rram {
+	reg = < 0x0 DT_SIZE_K(1524) >;
+};
+
 / {
 	/* Disable pwmleds and redefine them to align configuration with CAF LEDs requirements.
 	 * The configuration needs to match the used board revision (v0.3.0).