regulator: qcom-rpmh-regulator: Repair dodgy kerneldoc header formatting

W=1 kernel builds report a lack of descriptions for various
enum properties and function arguments.  In reality they are
documented, but the formatting was not as expected '@.*:'.
Instead, some weird arg identifiers were used or none at all.

This change fixes the following warnings:

 drivers/regulator/qcom-rpmh-regulator.c:33: warning: Enum value 'VRM' not described in enum 'rpmh_regulator_type'
 drivers/regulator/qcom-rpmh-regulator.c:33: warning: Enum value 'XOB' not described in enum 'rpmh_regulator_type'
 drivers/regulator/qcom-rpmh-regulator.c:416: warning: Function parameter or member 'vreg' not described in 'rpmh_regulator_init_vreg'
 drivers/regulator/qcom-rpmh-regulator.c:416: warning: Function parameter or member 'dev' not described in 'rpmh_regulator_init_vreg'
 drivers/regulator/qcom-rpmh-regulator.c:416: warning: Function parameter or member 'node' not described in 'rpmh_regulator_init_vreg'
 drivers/regulator/qcom-rpmh-regulator.c:416: warning: Function parameter or member 'pmic_id' not described in 'rpmh_regulator_init_vreg'
 drivers/regulator/qcom-rpmh-regulator.c:416: warning: Function parameter or member 'pmic_rpmh_data' not described in 'rpmh_regulator_init_vreg'

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Andy Gross <agross@kernel.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: linux-arm-msm@vger.kernel.org
Link: https://lore.kernel.org/r/20200626065738.93412-3-lee.jones@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>