snippets: sdp: mspi: change frequency to 13 MHz

Real frequency will be in that case 12.8 MHz.

Signed-off-by: Marcin Szymczyk <marcin.szymczyk@nordicsemi.no>

Author: masz-nordic

snippets/sdp/mspi/board/nrf54l15dk_nrf54l15_cpuapp.overlay

@@ -25,7 +25,7 @@
 		t-exit-dpd = <35000>;
 		reset-gpios = <&gpio2 0 GPIO_ACTIVE_LOW>;
 
-		mspi-max-frequency = <DT_FREQ_M(1)>;
+		mspi-max-frequency = <DT_FREQ_M(13)>;
 		mspi-io-mode = "MSPI_IO_MODE_QUAD_1_4_4";
 		mspi-data-rate = "MSPI_DATA_RATE_SINGLE";
 		mspi-hardware-ce-num = <0>;