ACPICA: Add dragon_fly support to unix file mapping file

ACPICA commit 795b215d6fd062386f0a1c23dff9ffa244683c4f

ACPICA BZ 1130

This patch doesn't affect Linux kernel.

Link: https://bugs.acpica.org/show_bug.cgi?id=1130
Link: https://github.com/acpica/acpica/commit/795b215d


Signed-off-by: Sascha Wildner <swildner@gmail.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>