Makefile.am: Fix mixed tabs and spaces
Makefile.am: Fix mixed tabs and spaces

In some cases I noticed build is failing possibly due to
mixed tabs and spaces in Makefile.

Signed-off-by: Kun Yi <1f1e6c84c8d73059e2ad4603a830c197526c9da4@gmail.com>
Change-Id: I5d724b9f48b583b50c71b3e03884c88f9eb8d6de

openbmc/phosphor-settingsd,openbmc/phosphor-settingsd,openbmc/phosphor-settingsd