mtd: nand: raw: rockchip_nfc: remove the compatible string "rockchip,rk3308-nfc"

mtd: nand: raw: rockchip_nfc: remove the compatible string "rockchip,rk3308-nfc"

The compatible string for rk3308 has as fallback string
"rockchip,rv1108-nfc". As there is no logic in probe priority between
the SoC orientated string and the fall back, so remove the compatible
string "rockchip,rk3308-nfc" from the driver.

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Michael Trimarchi <michael@amarulasolutions.com>