phosphor-led-manager: pass led yaml to build

phosphor-led-manager has migrated from autotools to meson, and it needs
to be built with the correct led.yaml.
This will check if there's a led.yaml in the order of:
1. where LED_YAML_PATH specifies
2. default path of virtual/phosphor-led-manager-config-native
3. where SRC_URI += puts files to
and copies it to the right location.

Tested:
devtool modify phosphor-led-manager and checked if led.yaml is the
right one.
devtool reset, built the image and checked if led-manager are hosting
the correct led groups on dbus.
tried five different scenarios:
1. don't use phosphor-led-manager at all: yosemitev2
2. use config-native: romulus
3. use config-mrw-native: witherspoon
4. overrides the native path: hr855xg2
5. puts led.yaml in SRC_URI: created a custom one and tested that

Signed-off-by: Seires Li <seiresli@pcpartner.com>
Change-Id: Iacfbe633befd3f50f5ea685fd234a49e0eeb7b6f

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