meta-ibm: phosphor-hwmon: Create machine-specific structure

Yocto automatically adds files/<MACHINE>/ to the file path, take
advantage of this feature to simplify the recipe and directory
structure.

Tested: Built witherspoon, witherspoon-128, and swift, and verified
        they had the right conf file:

$ diff tmp/work/witherspoon_128-openbmc-linux-gnueabi/obmc-phosphor-image/1.0-r0/rootfs/etc/default/obmc/hwmon/ahb/apb/bus@1e78a000/i2c-bus@100/max31785@52_air.conf \
       tmp/work/witherspoon-openbmc-linux-gnueabi/obmc-phosphor-image/1.0-r0/rootfs/etc/default/obmc/hwmon/ahb/apb/bus@1e78a000/i2c-bus@100/max31785@52_air.conf
$

$ diff tmp/work/witherspoon-openbmc-linux-gnueabi/obmc-phosphor-image/1.0-r0/rootfs/etc/default/obmc/hwmon/ahb/apb/bus@1e78a000/i2c-bus@100/max31785@52_air.conf \
       tmp/work/swift-openbmc-linux-gnueabi/obmc-phosphor-image/1.0-r0/rootfs/etc/default/obmc/hwmon/ahb/apb/bus@1e78a000/i2c-bus@100/max31785@52_air.conf
2,3c2,3
< CRITLO_fan1 = "2974"
< CRITHI_fan1 = "12076"
---
...

Change-Id: Iecabf8aec1d69e316fb9e2e7d6eba1d936de549b
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
18 files changed