Select Ralink MIPS SoC type.
config SOC_RT288X
bool "RT288x"
select MIPS_AUTO_PFN_OFFSET
select MIPS_L1_CACHE_SHIFT_4
select HAVE_LEGACY_CLK
select HAVE_PCI
config SOC_RT305X
bool "RT305x"
select HAVE_LEGACY_CLK
config SOC_RT3883
bool "RT3883"
select HAVE_LEGACY_CLK
select HAVE_PCI
config SOC_MT7620
bool "MT7620/8"
select CPU_MIPSR2_IRQ_VI
select HAVE_LEGACY_CLK
select HAVE_PCI
config SOC_MT7621
bool "MT7621"
select MIPS_CPU_SCACHE
select SYS_SUPPORTS_MULTITHREADING
select SYS_SUPPORTS_SMP
select SYS_SUPPORTS_MIPS_CPS
select SYS_SUPPORTS_HIGHMEM
select MIPS_GIC
select COMMON_CLK
select CLKSRC_MIPS_GIC
select HAVE_PCI if PCI_MT7621
select SOC_BUS