CONFIG_NET_DSA_MV88E6XXX_PTP was simply missing in generic config.
CONFIG_I2C_PXA_SLAVE was previously enabled via i2c-pxa package,
but got removed there without moving the symbol to generic config.
Fixes: dd13add3ce ("kernel: i2c-pxa: remove slave")
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>