hostapd(vts): Use the correct syntax for vendor prop

Change the prop to add "ro.vendor." prefix for the new vendor prop.

Bug: 136645414
Change-Id: I5edfdc98991068eac279975397b6a29313bf31da
Merged-In: I5edfdc98991068eac279975397b6a29313bf31da
(cherry-picked from 4335de4cac65acd3f8cffc88c91982d0cea999d1)
1 file changed