Add sepolicy for fastbootd

Also allow adb and fastboot to talk to recovery
through recovery_socket. This enables changing
between modes with usb commands.

Test: No selinux denials
Bug: 78793464
Change-Id: I80c54d4eaf3b94a1fe26d2280af4e57cb1593790
diff --git a/private/fastbootd.te b/private/fastbootd.te
new file mode 100644
index 0000000..29a9157
--- /dev/null
+++ b/private/fastbootd.te
@@ -0,0 +1 @@
+typeattribute fastbootd coredomain;