Fix IBM Power HMC vendor type
Fix IBM Power HMC vendor type

Use "IBM Power HMC" consistently as the vendor. "IBM PowerVM" isn't
_wrong_, but ManageIQ uses vendor to display the Provider type (and
icon) so consistency is preferred.

ManageIQ/manageiq,agrare/manageiq,ManageIQ/manageiq,jrafanie/manageiq,jrafanie/manageiq,agrare/manageiq,kbrock/manageiq,ManageIQ/manageiq,mzazrivec/manageiq,kbrock/manageiq,jrafanie/manageiq,kbrock/manageiq,agrare/manageiq,mzazrivec/manageiq,ManageIQ/manageiq,kbrock/manageiq,agrare/manageiq,jrafanie/manageiq,mzazrivec/manageiq,mzazrivec/manageiq