load selinux mapping ignore file in BOARD_PLAT_PRIVATE_SEPOLICY_DIR

Now it can only load selinux mapping ignore file in system/sepolicy/private,
But for google's partners, we want to add selinux mapping ignore file in BOARD_PLAT_PRIVATE_SEPOLICY_DIR.

Test: it can load load selinux mapping ignore file in BOARD_PLAT_PRIVATE_SEPOLICY_DIR
Change-Id: I983422c21fe027fcb17c175357a26845eb977669
1 file changed