soc: qcom: smem: Fix formatting and missing documentation issues

Fixes the following W=1 kernel build warning(s):

 drivers/soc/qcom/smem.c:135: warning: Function parameter or member 'toc' not described in 'smem_header'
 drivers/soc/qcom/smem.c:275: warning: Function parameter or member 'socinfo' not described in 'qcom_smem'

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/20201103152838.1290217-17-lee.jones@linaro.org


Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>