riscv-rt: Add uninit section
#329
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I encountered linker errors trying to build RTIC examples on RISC-V. The reason was that the linker could not find any empty spot in RAM to place the
.uninitsection. This PR mimics the.uninitsection ofcortex-m-rt. The linker will put it in the same memory region as.bss, considering that both sections have a very similar purpose.