mediatek: filogic: fix bpi-r4 eeprom dtc warnings

mediatek: filogic: fix bpi-r4 eeprom dtc warnings

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

mt7988a-bananapi-bpi-r4-wifi-mt7996a.dtso:31.5-18: Warning (reg_format): /fragment@1/__overlay__/wifi_eeprom@51:reg: property has invalid length (4 bytes) (#address-cells == 2, #size-cells == 1)
mt7988a-bananapi-bpi-r4-wifi-mt7996a.dtso:50.5-18: Warning (reg_format): /fragment@1/__overlay__/wifi_eeprom@52:reg: property has invalid length (4 bytes) (#address-cells == 2, #size-cells == 1)

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