soc: qcom: smp2p: Remove unused struct attribute provide another

Fixes the following W=1 kernel build warning:

 drivers/soc/qcom/smp2p.c:149: warning: Function parameter or member 'out' not described in 'qcom_smp2p'

Cc: Andy Gross <agross@kernel.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: linux-arm-msm@vger.kernel.org
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20201103152838.1290217-20-lee.jones@linaro.org


[bjorn: Dropped hunk that fixed the same warning in smp2p_smem_item]
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>