ramips: allow to specify port layout for the switch of the RT305x/RT3350

...s/arch/mips/include/asm/mach-ralink/rt305x_esw_platform.h

.../ramips/files/arch/mips/ralink/rt305x/mach-dir-300-revb.c

...ux/ramips/files/arch/mips/ralink/rt305x/mach-f5d8235-v2.c

...nux/ramips/files/arch/mips/ralink/rt305x/mach-fonera20n.c

...inux/ramips/files/arch/mips/ralink/rt305x/mach-hw550-3g.c

.../ramips/files/arch/mips/ralink/rt305x/mach-mofi3500-3gn.c

...t/linux/ramips/files/arch/mips/ralink/rt305x/mach-nw718.c

...linux/ramips/files/arch/mips/ralink/rt305x/mach-pwh2004.c

...x/ramips/files/arch/mips/ralink/rt305x/mach-rt-g32-revb.c

...nux/ramips/files/arch/mips/ralink/rt305x/mach-v22rw-2x2.c

...inux/ramips/files/arch/mips/ralink/rt305x/mach-wcr150gn.c

...nux/ramips/files/arch/mips/ralink/rt305x/mach-whr-g300n.c

target/linux/ramips/files/drivers/net/ramips_esw.c