ANDROID: Add extcon.h and dwc3/core.h to aarch64 allowlist

Export the headers in all_headers_allowlist_aarch64, for display/samsung
drivers to use.

Bug: 343869732
Test: Verified the display/samsung ddk modules are able to include the
header.
Change-Id: Ibcf53afdea01d81c9698bbad6df6b2dde8e65b37
Signed-off-by: Yuan-Jen Cheng <cyuanjen@google.com>
(cherry picked from commit dc1286d9)
Signed-off-by: Jacky Liu <qsliu@google.com>