regulator: qcom-rpmh-regulator: fix pm8009-1 ldo7 resource name

Fix a typo in the pm8009 LDO7 declaration, it uses resource name ldo%s6
instead of ldo%s7.

Fixes: 951384ca ("regulator: qcom-rpmh-regulator: add pm8009-1 chip revision")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>