bus: qcom-ebi2: Fix incorrect documentation for '{slow,fast}_cfg'

bus: qcom-ebi2: Fix incorrect documentation for '{slow,fast}_cfg'

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

 drivers/bus/qcom-ebi2.c:112: warning: Function parameter or member 'slow_cfg' not described in 'cs_data'
 drivers/bus/qcom-ebi2.c:112: warning: Function parameter or member 'fast_cfg' not described in 'cs_data'

Reviewed-by: Linus Walleij <linus.walleij@linaro.org
Cc: Andy Gross <agross@kernel.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: linux-arm-msm@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20210526081038.544942-8-lee.jones@linaro.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>