Add nodes for the Riva PIL, IRIS RF module, BT and WiFI services exposed
by the Riva firmware and the related memory reserve.

Also provides pinctrl nodes for devices enabling the riva-pil.

Cc: John Stultz <john.stultz@linaro.org>
Signed-off-by: NBjorn Andersson <bjorn.andersson@linaro.org>
Tested-by: NJohn Stultz <john.stultz@linaro.org>
Signed-off-by: NAndy Gross <andy.gross@linaro.org>