The arm64 virtual addresses of kernel are like:
VA_START < MODULES_VADDR < KIMAGE_VADDR < PAGE_OFFSET.
PAGE_OFFSET is the virtual address of the start of the linear map.
And the vmalloc, kernel code and so on are between VA_START and
PAGE_OFFSET, so it is necessary to expand dump addresses to VA_START,
instead of PAGE_OFFSET.
Change-Id: I810ed216862de4c6e68b92d483de4aa68da532b8
Signed-off-by: Huibin Hong <huibin.hong@rock-chips.com>