meta-fii: fii-ipmi: Fix missing dependency

e.g.
| CMake Error at /opt/openbmc/build/kudo/tmp/work/armv7a-openbmc-linux-gnueabi/fii-ipmi-oem/git-r0/recipe-sysroot-native/usr/share/cmake-3.21/Modules/FindPackageHandleStandardArgs.cmake:230 (message):
|   Could NOT find PkgConfig (missing: PKG_CONFIG_EXECUTABLE)

Change-Id: Ie9667094c782072614ff5dccd61a1cf31ebd5589
Signed-off-by: Peter Foley <pefoley@google.com>