vtop: unfity all cases with the same vtop() function

There are multiple implementations of vtop() function, remove extra copies
of the vtop() function and use the one from proc_pagemap.c

Suggested-by: Luck, Tony <tony.luck@intel.com>
Signed-off-by: Shuai Xue <xueshuai@linux.alibaba.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
9 files changed