Move hci_attach to hikey

This is unused by core policy and by any device policy except for hikey.

Test: device boots
Test: no denials ever collected
Change-Id: I36a6790499e4aeedd808457b43fd72370fa48e53

private/hci_attach.te

-# type_transition must be private policy the domain_trans rules could stay
-# public, but conceptually should go with this
-init_daemon_domain(hci_attach)

public/hci_attach.te

-type hci_attach, domain, domain_deprecated;
-type hci_attach_exec, exec_type, file_type;
-
-allow hci_attach kernel:system module_request;
-allow hci_attach hci_attach_dev:chr_file rw_file_perms;
-allow hci_attach bluetooth_efs_file:dir r_dir_perms;
-allow hci_attach bluetooth_efs_file:file r_file_perms;