LoongArch: Make relocate_new_kernel_size be a .quad value

Now relocate_new_kernel_size is a .long value, which means 32bit, so its
high 32bit is undefined. This causes memcpy((void *)reboot_code_buffer,
relocate_new_kernel, relocate_new_kernel_size) in machine_kexec_prepare()
access out of range memories in some cases, and then end up with an ADE
exception.

So make relocate_new_kernel_size be a .quad value, which means 64bit, to
avoid such errors.

Cc: stable@vger.kernel.org
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

Author: chenhuacai

arch/loongarch/kernel/relocate_kernel.S

@@ -109,4 +109,4 @@ SYM_CODE_END(kexec_smp_wait)
 relocate_new_kernel_end:
 
 	.section ".data"
-SYM_DATA(relocate_new_kernel_size, .long relocate_new_kernel_end - relocate_new_kernel)
+SYM_DATA(relocate_new_kernel_size, .quad relocate_new_kernel_end - relocate_new_kernel)