Arrange for the IPA driver to be built when COMPILE_TEST is enabled.

Update the help text to reflect that we support two Qualcomm SoCs.
Suggested-by: NJakub Kicinski <kuba@kernel.org>
Signed-off-by: NAlex Elder <elder@linaro.org>
Reviewed-by: NBjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: NJakub Kicinski <kuba@kernel.org>