put RODATA of libphy.a into DRAM

put RODATA of libphy.a into DRAM

    There are some RODATAs of libphy.a that are called in ISR. So need
    to put them into DRAM to avoid access them when R/W SPI flash. Due
    to the RODATAs which are called in ISR haven't been picked out to
    put into DRAM, put all of the RODATA of libphy.a into DRAM. This
    will be optimized in the future.