MIPS: Kexec: Init the arguments for the new kernel image

Whenever the kexec-tools pass the command lines to the new kernel image,
init the arguments as the ones for the 1st kernel image. This fixed the
booting failure of Kexec on YeeLoong.

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
MIPS: Kexec: Init the arguments for the new kernel image

Whenever the kexec-tools pass the command lines to the new kernel image,
init the arguments as the ones for the 1st kernel image. This fixed the
booting failure of Kexec on YeeLoong.

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>