bus: qcom: fix spelling mistake "ambigous" -> "ambiguous"

There is a spelling mistake on the documentation. Fix it.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/bus/qcom,ebi2.txt

@@ -71,7 +71,7 @@ Optional subnodes:
 
 The following optional properties are properties that can be tagged onto
 any device subnode. We are assuming that there can be only ONE device per
-chipselect subnode, else the properties will become ambigous.
+chipselect subnode, else the properties will become ambiguous.
 
 Optional properties arrays for SLOW chip selects:
 - qcom,xmem-recovery-cycles: recovery cycles is the time the memory continues to