python-pyyaml: remove unneeded bbappend

meta-oe subtree's recipe already contains the BBCLASSEXTEND.

(From meta-phosphor rev: dc3061d026743b883b6f7a984680e5b155263073)

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I5ceff876c7d956f7953680ae7c0b5960d6a3ec4b
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-phosphor/recipes-devtools/python/python-pyyaml_%.bbappend b/meta-phosphor/recipes-devtools/python/python-pyyaml_%.bbappend
deleted file mode 100644
index 2a59083..0000000
--- a/meta-phosphor/recipes-devtools/python/python-pyyaml_%.bbappend
+++ /dev/null
@@ -1 +0,0 @@
-BBCLASSEXTEND += "nativesdk"