ipa: Declare the ipaCreate() function prototype

IPA modules have to implement a public ipaCreate() function, but its
prototype isn't declared in any header file. This allows for modules to
get the prototype wrong without being warned by the compiler. Fix it.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

include/ipa/ipa_interface.h

@@ -80,6 +80,8 @@ struct ipa_context_ops {
 			      const struct ipa_operation_data *data);
 };
 
+struct ipa_context *ipaCreate();
+
 #ifdef __cplusplus
 }