pci-dma-compat: add pci_zalloc_consistent helper

Add this helper for consistency with pci_zalloc_coherent
and the ability to remove unnecessary memset(,0,) uses.

Signed-off-by: Joe Perches <joe@perches.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: "James E.J. Bottomley" <JBottomley@parallels.com>
Cc: "John W. Linville" <linville@tuxdriver.com>
Cc: "Stephen M. Cameron" <scameron@beardog.cce.hp.com>
Cc: Adam Radford <linuxraid@lsi.com>
Cc: Chaoming Li <chaoming_li@realsil.com.cn>
Cc: Chas Williams <chas@cmf.nrl.navy.mil>
Cc: Christian Benvenuti <benve@cisco.com>
Cc: Christopher Harrer <charrer@alacritech.com>
Cc: Dario Ballabio <ballabio_dario@emc.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Don Fry <pcnet32@frontier.com>
Cc: Faisal Latif <faisal.latif@intel.com>
Cc: Forest Bond <forest@alittletooquiet.net>
Cc: Govindarajulu Varadarajan <_govind@gmx.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Hal Rosenstock <hal.rosenstock@gmail.com>
Cc: Hans Verkuil <hverkuil@xs4all.nl>
Cc: Jayamohan Kallickal <jayamohan.kallickal@emulex.com>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Jitendra Kalsaria <jitendra.kalsaria@qlogic.com>
Cc: Larry Finger <Larry.Finger@lwfinger.net>
Cc: Lennert Buytenhek <buytenh@wantstofly.org>
Cc: Lior Dotan <liodot@gmail.com>
Cc: Manish Chopra <manish.chopra@qlogic.com>
Cc: Manohar Vanga <manohar.vanga@gmail.com>
Cc: Martyn Welch <martyn.welch@ge.com>
Cc: Mauro Carvalho Chehab <m.chehab@samsung.com>
Cc: Michael Neuffer <mike@i-Connect.Net>
Cc: Mirko Lindner <mlindner@marvell.com>
Cc: Neel Patel <neepatel@cisco.com>
Cc: Neela Syam Kolli <megaraidlinux@lsi.com>
Cc: Rajesh Borundia <rajesh.borundia@qlogic.com>
Cc: Roland Dreier <roland@kernel.org>
Cc: Ron Mercer <ron.mercer@qlogic.com>
Cc: Samuel Ortiz <samuel@sortiz.org>
Cc: Sean Hefty <sean.hefty@intel.com>
Cc: Shahed Shaikh <shahed.shaikh@qlogic.com>
Cc: Sony Chacko <sony.chacko@qlogic.com>
Cc: Stanislav Yakovlev <stas.yakovlev@gmail.com>
Cc: Stephen Hemminger <stephen@networkplumber.org>
Cc: Steve Wise <swise@opengridcomputing.com>
Cc: Sujith Sankar <ssujith@cisco.com>
Cc: Tom Tucker <tom@opengridcomputing.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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