arm64: dts: mediatek: mt6795: xperia-m5: Enable Frequency Hopping

Enable FHCTL with Spread Spectrum for MAINPLL, MPLL and MSDCPLL
as found on the downstream kernel for this smartphone.
Which one to enable, and at what SSC percentage, was found by
dumping the debugging data from a running downstream kernel and
checking the downstream code.

/proc/freqhopping # cat status
FH status:
===============================================
id == fh_status == pll_status == setting_id == curr_freq == user_defined
 0           0             1             0      1599000         0
 1           0             1             0      1716000         0
 2           1             1             2      1092000         0
 3           1             1             2      2912000         0
 4           1             0             2      1600000         0
 5           0             0             0            0         0
 6           0             1             0      1518002         0
 7           0             0             0            0         0
 8           0             0             0            0         0

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20230327083647.22017-4-angelogioacchino.delregno@collabora.com
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>

Author: AngeloGioacchino Del Regno

arch/arm64/boot/dts/mediatek/mt6795-sony-xperia-m5.dts

@@ -48,6 +48,13 @@
 	};
 };
 
+&fhctl {
+	clocks = <&apmixedsys CLK_APMIXED_MAINPLL>, <&apmixedsys CLK_APMIXED_MPLL>,
+		 <&apmixedsys CLK_APMIXED_MSDCPLL>;
+	mediatek,hopping-ssc-percent = <8>, <5>, <8>;
+	status = "okay";
+};
+
 &pio {
 	uart0_pins: uart0-pins {
 		pins-rx {