boost: define required dependency in recipe

Latest upstream yocto is failing due to being unable to find the boost
header files. Define the needed dependency.

Tested:
Verified with the corresponding meson.build change that phosphor-power
now builds against upstream yocto

(From meta-phosphor rev: da29f23ed62d5fa26c83b422e1e09b796dd75a52)

Change-Id: Iaeaeaaf7f5718210e2c0a5c9ec329db9f1926d9e
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/meta-phosphor/recipes-phosphor/power/phosphor-power_git.bb b/meta-phosphor/recipes-phosphor/power/phosphor-power_git.bb
index cf853d2..8c68d91 100644
--- a/meta-phosphor/recipes-phosphor/power/phosphor-power_git.bb
+++ b/meta-phosphor/recipes-phosphor/power/phosphor-power_git.bb
@@ -41,6 +41,7 @@
          ${PYTHON_PN}-pyyaml-native \
          ${PYTHON_PN}-setuptools-native \
          ${PYTHON_PN}-mako-native \
+         boost \
          "
 
 SEQ_MONITOR_SVC = "pseq-monitor.service"