dbus-sdr: Add hybrid sensors stack option

Because the dynamic sensor stack doesn't support non-threshold sensors,
this patch gives way for retrieving non-threshold sensors by walking
through the sensor.yaml. However, this patch filters out any threshold
sensors written in the sensor yaml file because the current dbus-sdr
already supports them.

The sensor stack has both dynamic and static in this patch, so this new
feature is named hybrid sensor stack.

Tested: Try the SDR get command
0xF9:
  entityID: 0x21
  entityInstance: 0
  interfaces:
    xyz.openbmc_project.State.Watchdog:
      ExpireAction:
        Offsets:
          0x00:
            assert: xyz.openbmc_project.State.Watchdog.Action.None
            type: string
          0x01:
            assert: xyz.openbmc_project.State.Watchdog.Action.HardReset
            type: string
          0x02:
            assert: xyz.openbmc_project.State.Watchdog.Action.PowerOff
            type: string
          0x03:
            assert: xyz.openbmc_project.State.Watchdog.Action.PowerCycle
            type: string
  mutability: Mutability::Read
  path: /xyz/openbmc_project/watchdog/host0
  readingType: assertion
  sensorNamePattern: nameLeaf
  sensorReadingType: 0x6F
  sensorType: 0x23
  serviceInterface: org.freedesktop.DBus.Properties

$ ipmitool sdr get host0
Sensor ID              : host0 (0xcd)
 Entity ID             : 33.0 (System Management Software)
 Sensor Type (Discrete): Watchdog2 (0x23)
 Sensor Reading        : 0h
 Event Message Control : Per-threshold
 States Asserted       : Watchdog2
                         [Hard reset]
 Event Status          : Event Messages Disabled
 Assertion Events      : Watchdog2
                         [Hard reset]
 Event Enable          : Event Messages Disabled
 Assertions Enabled    : Watchdog2
                         [Timer expired]
                         [Hard reset]
                         [Power down]
                         [Power cycle]
 OEM                   : 0

Signed-off-by: Scron Chang <Scron.Chang@quantatw.com>
Change-Id: I1ac16f483f2f725077de9c15595195b848a224ab
diff --git a/Makefile.am b/Makefile.am
index fbeb379..3e25794 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -168,6 +168,9 @@
 providers_LTLIBRARIES += libdynamiccmds.la
 libdynamiccmds_la_LIBADD = \
 	libipmid/libipmid.la
+if FEATURE_HYBRID_SENSORS
+libdynamiccmds_la_LIBADD += libipmi20.la
+endif
 libdynamiccmds_la_SOURCES = \
 	dbus-sdr/sensorcommands.cpp \
 	dbus-sdr/storagecommands.cpp \