remoteproc: Kconfig: Fix cherry-pick misstake

The cherry-pick from upstream got the Kconfig update wrong, so drop the
unwanted select of IRIS as this module was removed in the patch.

Fixes: 0aa060a7 ("remoteproc: qcom_wcnss: Fix circular module dependency")
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>