gcr, gpg2: replace Tizen gpg2 with meta-oe gnupg

gcr, gpg2: replace Tizen gpg2 with meta-oe gnupg

After the version bump, the gpg2 patches no longer applied
and without them the recipe did not compile, because upstream
GnuPG relies on config scripts, which are disabled when building
with bitbake.

Instead of sorting that out, let's use the available gnupg recipe.
It compiles the same version, 2.0.26.

Change-Id: I0b5bd98a8107d896e875e911fab080cccb588692