dt-bindings: PCI: dra7xx: Add DT bindings to enable unaligned access

Update device tree binding documentation of TI's dra7xx PCI controller to
include property for enabling unaligned mem access.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

Documentation/devicetree/bindings/pci/ti-pci.txt

@@ -39,6 +39,11 @@ DEVICE MODE
  - interrupts : one interrupt entries must be specified for main interrupt.
  - num-ib-windows : number of inbound address translation windows
  - num-ob-windows : number of outbound address translation windows
+ - ti,syscon-unaligned-access: phandle to the syscon DT node. The 1st argument
+			       should contain the register offset within syscon
+			       and the 2nd argument should contain the bit field
+			       for setting the bit to enable unaligned
+			       access.
 
 Optional Property:
  - gpios : Should be added if a gpio line is required to drive PERST# line