genirq: Split out flow handler typedefs into seperate header file

Required to avoid circular include dependencies.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Git-commit: 75ffc0075007ca649131a2c42863ce6995d9bf80
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Signed-off-by: Puja Gupta <pujag@codeaurora.org>