pkgconfig: Upgrade to latest git tip

0.28 was released 2 years ago and bunch of patches
have gone in since. The commit rate is quite low
so its not a lot of churn to use. We have backports
for few bugs that are removed. Git version of recipe is removed too
since its no longer needed

Change-Id: I4b57db15320c76b1de5d26a733e60436663ff34a
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>