linux-yocto/4.1: ahci: backport AHCI runtime PM
enabling AHCI runtime PM support via the following commits:
f5b08e95bc03 ahci: Add runtime PM support for the host controller
e05e05973f39 ahci: Add functions to manage runtime PM of AHCI ports
558571930e2d ahci: Convert driver to use modern PM hooks
4a2c2074f209 ahci: Cache host controller version
21641413456c scsi: Drop runtime PM usage count after host is added
254ab69f652d scsi: Set request queue runtime PM status back to active on resume
61c02cb167ed block: Add blk_set_runtime_active()
7bcfbac98f3c ahci: Store irq number in struct ahci_host_priv
a5a093b7f6e4 ahci: Move interrupt enablement code to a separate function
Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
