riscv: use KERN_INFO in do_trap

Print the instruction dump with info instead of emergency level.  The
unhandled signal message is only for informational purpose.

Fixes: b8a03a63 ("riscv: add userland instruction dump to RISC-V splats")
Signed-off-by: Andreas Schwab <schwab@suse.de>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Reviewed-by: Yunhui Cui <cuiyunhui@bytedance.com>
Link: https://lore.kernel.org/r/mvmy1aegrhm.fsf@suse.de


Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>