Add `.option norvc` to several RISC-V tests to avoid compressed
instruction generation. This ensures consistent disassembly and
alignment behavior regardless of assembler default options.
Discussion see:
https://patchwork.sourceware.org/project/binutils/patch/
20250910120916.
1103023-1-jiawei@iscas.ac.cn/
gas/ChangeLog:
* testsuite/gas/riscv/dis-partial-insn.s: Limit compressed.
* testsuite/gas/riscv/no-relax-align.s: Ditto.
* testsuite/gas/riscv/odd-padding.s: Ditto.
* testsuite/gas/riscv/t_insns.s: Ditto.
* testsuite/gas/riscv/tlsdesc.s: Ditto.