msm: rpm-regulator: fix parameter usage in part helper macros

The SET_PART, GET_PART, and USES_PART macros incorrectly use
"vreg" in place of the actual parameter name "_vreg"; correct
this.

Change-Id: I89f41750d2afe63dd8ef96dd2dfc521f14934fae
Signed-off-by: David Collins <collinsd@codeaurora.org>
1 file changed