regulator: qcom_spmi: Indent with tabs instead of spaces

Fix the following checkpatch error:

ERROR: code indent should use tabs where possible
+        { }$

Fixes: ca5cd8c9 ("regulator: qcom_spmi: Add support for pmi8994")
Signed-off-by: Niklas Cassel <niklas.cassel@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>