mediatek: filogic: fix "srg,sysled" dtc warnings

mediatek: filogic: fix "srg,sysled" dtc warnings

Add missing #address-cells and #size-cells to fix the
following dtc warnings:

../dts/mt7986a-smartrg-bonanza-peak.dtsi:562.4-14: Warning (reg_format): /soc/i2c@11008000/system-leds/led@1:reg: property has invalid length (4 bytes) (#address-cells == 2, #size-cells == 1)
../dts/mt7986a-smartrg-bonanza-peak.dtsi:568.4-14: Warning (reg_format): /soc/i2c@11008000/system-leds/led@2:reg: property has invalid length (4 bytes) (#address-cells == 2, #size-cells == 1)
../dts/mt7986a-smartrg-bonanza-peak.dtsi:574.4-14: Warning (reg_format): /soc/i2c@11008000/system-leds/led@3:reg: property has invalid length (4 bytes) (#address-cells == 2, #size-cells == 1)
../dts/mt7986a-smartrg-bonanza-peak.dtsi:580.4-14: Warning (reg_format): /soc/i2c@11008000/system-leds/led@4:reg: property has invalid length (4 bytes) (#address-cells == 2, #size-cells == 1)
../dts/mt7988a-smartrg-mt-stuart.dtsi:394.4-14: Warning (reg_format): /soc/i2c@11004000/system-leds/system_red:reg: property has invalid length (4 bytes) (#address-cells == 2, #size-cells == 1)
../dts/mt7988a-smartrg-mt-stuart.dtsi:399.4-14: Warning (reg_format): /soc/i2c@11004000/system-leds/system_green:reg: property has invalid length (4 bytes) (#address-cells == 2, #size-cells == 1)
../dts/mt7988a-smartrg-mt-stuart.dtsi:404.4-14: Warning (reg_format): /soc/i2c@11004000/system-leds/system_blue:reg: property has invalid length (4 bytes) (#address-cells == 2, #size-cells == 1)
../dts/mt7988a-smartrg-mt-stuart.dtsi:409.4-14: Warning (reg_format): /soc/i2c@11004000/system-leds/system_white:reg: property has invalid length (4 bytes) (#address-cells == 2, #size-cells == 1)
../dts/mt7986a-smartrg-bonanza-peak.dtsi:559.14-588.4: Warning (i2c_bus_reg): /soc/i2c@11008000/system-leds: I2C bus unit address format error, expected "30"
../dts/mt7988a-smartrg-mt-stuart.dtsi:388.14-413.4: Warning (i2c_bus_reg): /soc/i2c@11004000/system-leds: I2C bus unit address format error, expected "30"

Signed-off-by: Shiji Yang <[email protected]>