smolkit: Only provide polkit when selected

Universe builds every recipe, so the unconditional PROVIDES puts this
recipe and polkit in the same build, and bitbake -c fetch universe
reports that multiple .bb files provide polkit.

Claim the name only when PREFERRED_PROVIDER_polkit selects smolkit. With
the overlap gone, smolkit is no longer dropped from the world targets.

AI-Generated: Uses Claude Code
Signed-off-by: Khem Raj <khem.raj@oss.qualcomm.com>

meta-oe/recipes-extended/smolkit/smolkit.bb

@@ -14,7 +14,9 @@ DEPENDS = "\
   sdbus-c++ \
 "
 
-PROVIDES += "polkit"
+# Only claim polkit when selected, universe builds both recipes otherwise and
+# bitbake reports that multiple .bb files provide polkit.
+PROVIDES += "${@'polkit' if d.getVar('PREFERRED_PROVIDER_polkit') == 'smolkit' else ''}"
 RPROVIDES:${PN} = "polkit"
 
 VERSION = "0.3.0"