recipes: update for PYPI_PACKAGE change

The pypi class has slightly changed the semantics of the PYPI_PACKAGE
variable[1], now PYPI_PACKAGE is the normalised package name and the new
variable PYPI_PACKAGE_SDIST is used when the source tarball doesn't match.

Update recipes as appropriate: this is mostly deleting now-redundant
assignments but some assignments are still needed where packages are not
uploaded using the modern standards.

[1] oe-core 98049bf86b6 ("classes/pypi: change PYPI_PACKAGE to be normalised")

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Khem Raj <khem.raj@oss.qualcomm.com>

meta-python/recipes-devtools/python/python3-requests-toolbelt_1.0.0.bb

@@ -13,6 +13,8 @@ SRC_URI[sha256sum] = "7681a0a3d047012b5bdc0ee37d7f8f07ebe76ab08caeccfc3921ce23c8
 
 inherit pypi setuptools3 ptest-python-pytest
 
+PYPI_PACKAGE_SDIST = "requests-toolbelt"
+
 RDEPENDS:${PN} += " \
     python3-requests (>=2.0.1) \
 "