soc: qcom: smem: Correct check for global partition

The move of the global partition check ended up in the wrong place and I
failed to spot this in my review. This moves it to the correct place.

Fixes: 11d2e7ed ("soc: qcom: smem: check sooner in qcom_smem_set_global_partition()")
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>