meta-witherspoon: Fix missing power-supply-monitor configs

The power-supply-monitor configs were installed by
SYSTEMD_ENVIRONMENT_FILE_${PN}, which is defined in
obmc-phosphor-systemd.bbclass.

phosphor-power recipe does not inherit obmc-phosphor-systemd, results in
the files installed by SYSTEMD_ENVIRONMENT_FILE_${PN} are not installed
at all.

Fix this issue by inherit obmc-phosphor-systemd in the bbappend.

Tested: Verify the witherspoon build includes the power-supply-monitor
        configs.

Change-Id: I86b93dc780d08e92f52072c43488ee673a5e32e3
Signed-off-by: Lei YU <mine260309@gmail.com>
1 file changed