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

Change-Id: I512555aa8b8d2d1fb4376a0d8bd69e98999ece36
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/recipes-phosphor/power/phosphor-power_git.bb b/recipes-phosphor/power/phosphor-power_git.bb
index cf853d2..8c68d91 100644
--- a/recipes-phosphor/power/phosphor-power_git.bb
+++ b/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"