fp5280g2: Load LED manager with JSON configuration

Since the led manager used the default YAML to generated led-gen.hpp and
creates D-Bus object for the groups, and we tend to use JSON instead of
YAML to create it.

Tested: built successfully on phosphor-led-manager and create D-Bus
object used JSON configuration.

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I7e15f56ec055c69e06259b0391810f5dcce89715
3 files changed