ANDROID: make sure all types for hooks are defined in KMI

There are 2 remaining types directly referenced by vendor
hooks that were not fully-defined in the KMI:

struct gic_chip_data : defined in include/linux/irqchip/arm-gic-v3.h
struct swap_slots_cache : defined include/linux/swap_slots.h

libabigail is not finding definitions based on the instantiation
of the hooks, so force them to be defined by defining dummy exported
symbols.

Update XML with the now visible definitions

Bug: 233047575
Signed-off-by: Todd Kjos <tkjos@google.com>
Change-Id: I521b2a596e1d7361d0f44a87ffe330186896b9f8