Make the implementations of RIL_onUnsolicitedResponse match the prototypes

Prototypes expect the data as a const void*, whereas the implementation
takes a void*.

This causes the build to break with clang and may also have other
unexpected side effects. (I'd expect to see unresolvable references in
some gcc builds.)

Change-Id: Ic34787da20abd2821730a18e49c0a435a82c2613
Signed-off-by: Bernhard Rosenkränzer <Bernhard.Rosenkranzer@linaro.org>
Merge "Make the implementations of RIL_onUnsolicitedResponse match the prototypes"