Your overlays=... line is a whole devicetree for the Pine64 which already gets loaded for your board, you only need a SPI overlay, see above in martin's post:
overlays=sun8i-h3-spi0-spidev
(A64 shares a lot of the peripherals with H3, it is basically a H3 with upgraded cores...)
overlays=sun8i-h3-spi0-spidev
(A64 shares a lot of the peripherals with H3, it is basically a H3 with upgraded cores...)
Come have a chat in the Pine IRC channel >>