soc: qcom: llcc-qcom: Fix expected kernel-doc formatting

soc: qcom: llcc-qcom: Fix expected kernel-doc formatting

Kernel-doc expects struct documentation to start with 'struct <name>'.

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

 drivers/soc/qcom/llcc-qcom.c:77: warning: cannot understand function prototype: 'struct llcc_slice_config '

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/20201103152838.1290217-21-lee.jones@linaro.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>