RISC-V: fix funct4 definition for c.jalr in parse_asm.h

RISC-V: fix funct4 definition for c.jalr in parse_asm.h

The opcode definition for c.jalr is
    c.jalr c_rs1_n0  1..0=2 15..13=4 12=1 6..2=0

This means funct4 consisting of bit [15:12] is 1001b, so the value is 0x9.

Fixes: edde5584c7ab ("riscv: Add SW single-step support for KDB")
Reported-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Signed-off-by: Heiko Stuebner <heiko.stuebner@vrull.eu>
Link: https://lore.kernel.org/r/20221223221332.4127602-2-heiko@sntech.de
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>