clear-once: Remove redundant RPROVIDES

PN is already included by RPROVIDES so there is no need to
set it again explicitly.

Tested: Built a palmetto image
Change-Id: I8efce4464ed6757a3e47d9fd95bb99dbee2c7056
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/common/recipes-phosphor/clear-once/clear-once.bb b/common/recipes-phosphor/clear-once/clear-once.bb
index 9c6f600..89b83ce 100644
--- a/common/recipes-phosphor/clear-once/clear-once.bb
+++ b/common/recipes-phosphor/clear-once/clear-once.bb
@@ -1,7 +1,5 @@
 SUMMARY = "Clear boot-once variables"
 DESCRIPTION = "Clear u-boot variables used for one-time boot flow"
 
-RPROVIDES_${PN} += "clear-once"
-
 inherit obmc-phosphor-systemd
 inherit obmc-phosphor-license