meta-ibm: witherspoon: rename phosphor-hwmon

Rename phosphor-hwmon%.bbappend to phosphor-hwmon_%.bbappend.

Tested: Built witherspoon and verified confs in rootfs.
Change-Id: I7d8204348933c077312b848c5fea6a27f9b85bed
Signed-off-by: Patrick Venture <venture@google.com>
19 files changed