Partial revert upstream commit 075dd2eef025 ("MIPS: lantiq: Remove unused function pointer variables") to fix the build error: mips-openwrt-linux-musl-ld: arch/mips/lantiq/xway/ath5k_eep.o: in function `of_ath5k_eeprom_probe': arch/mips/lantiq/xway/ath5k_eep.c:(.init.text+0x31c): undefined reference to `ltq_pci_plat_dev_init' mips-openwrt-linux-musl-ld: arch/mips/lantiq/xway/ath5k_eep.c:(.init.text+0x338): undefined reference to `ltq_pci_plat_dev_init' Signed-off-by: Shiji Yang <yangshiji66@outlook.com> lantiq: fix vmmc driver build warnings
