Add prefix to pkgconfig
Add prefix to pkgconfig

The pkg-config program used in the CI expects the `prefix` variable to
be set in the pkgconfig file. As such, this variable is added so that
the CI can pass.

This may not affect bitbake since the pkg-config program used by bitbake
may accept a pkgconfig file without a prefix variable in it.

Signed-off-by: Sui Chen <9248c5c1fabba1c69620ddd15d994b0ad46cbf85@google.com>
Change-Id: I9672597bf54044f2261f8cdc63bd21c5ebfba007

openbmc/phosphor-ipmi-blobs