The generic nand driver fails to load with:
gen_nand 14000000.nand-parts: platform_nand_data is missing
gen_nand: probe of 14000000.nand-parts failed with error -22
and the xway-nand driver is used afterwards.
Drop the gen_nand compatible to get rid of the error message.
Signed-off-by: Mathias Kresin <dev@kresin.me>