rx: Apply rx gdb patch to support rxv2 and rxv3 #20
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This update adds full support for the RXv2 and RXv3 architectures across GDB, BFD, opcodes, and the RX simulator.
These changes align GDB and binutils with the new GCC RX backend and enable debugging and simulation for RXv2 and RXv3 targets. The changes are pick from https://llvm-gcc-renesas.com/rx/rx-latest-source-code/