[ DO NOT MERGE ] usb: Add sepolicy for extcon access

USB gadget hal will access extcon folder so that this patch
will add new rule to allow USB gadget hal to access extcon.

Bug: 263435622
Test: verified pass
Change-Id: I8c265919f7ae4b18aa304b0a584536d2a0f4b27a
(cherry picked from commit 9828cc747a31ce31f5c6c687356dc1a302a8f90a)
Merged-In: I8c265919f7ae4b18aa304b0a584536d2a0f4b27a
1 file changed