riscv: hibernation: Replace jalr with jr before suspend_restore_regs

No need to link the x1/ra reg via jalr before suspend_restore_regs
So it's better to replace jalr with jr.

Signed-off-by: Song Shuai <suagrfillet@gmail.com>
Reviewed-by: JeeHeng Sia <jeeheng.sia@starfivetech.com >
Link: https://lore.kernel.org/r/20230519060854.214138-1-suagrfillet@gmail.com


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