[discussion] pci: imx: enable pcie msi support

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eanble pcie msi support on imx6 platforms
* add check_device api in the msi chip.
* add the quirks into pcie_port struct for the deviation
from standard routines.

Signed-off-by: Richard Zhu <richard.zhuhongxing@xxxxxxxxx>
---
 arch/arm/boot/dts/imx6qdl-sabresd.dtsi |    6 +++
 arch/arm/mach-imx/Kconfig              |    1 +
 drivers/pci/host/pci-imx6.c            |   34 +++++++++++++++++-
 drivers/pci/host/pcie-designware.c     |   60 +++++++++++++++++++++++---------
 drivers/pci/host/pcie-designware.h     |    5 +++
 5 files changed, 88 insertions(+), 18 deletions(-)
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