meta-python: drop ${PYTHON_PN}

python 2 is long unsupported, so we no longer need this variable.

Signed-off-by: Tim Orling <tim.orling@konsulko.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-python/recipes-devtools/python/python3-eth-rlp_1.0.1.bb

@@ -9,8 +9,8 @@ SRC_URI[sha256sum] = "d61dbda892ee1220f28fb3663c08f6383c305db9f1f5624dc585c9cd05
 inherit pypi setuptools3
 
 RDEPENDS:${PN} = " \
-    ${PYTHON_PN}-eth-utils \
-    ${PYTHON_PN}-hexbytes \
-    ${PYTHON_PN}-rlp \
-    ${PYTHON_PN}-typing-extensions \
+    python3-eth-utils \
+    python3-hexbytes \
+    python3-rlp \
+    python3-typing-extensions \
 "