ANDROID: GKI: genirq/irqdomain: add export symbols for modularizing

These symbols are needed for modularizing pinctrl.

Signed-off-by: Will McVicker <willmcvicker@google.com>
Bug: 145771121
Test: compile, boot
Change-Id: I8693c3a41b5fcab05b8e4a8a82f4057205bafd3b
(cherry picked from commit 9d2cbb36a60747e885f77d776a3ec2bf7523e2e6)