meta-phosphor: tpm2: remove new python3 dependency

The upstream meta-security added a new package to the tpm2
packagegroup, which introduced a dependency on python3.  This
package isn't necessary so we can remove it.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I53344425a3893c17d62ddd5687dd84ee112ee707
diff --git a/meta-phosphor/dynamic-layers/tpm-layer/recipes-core/packagegroups/packagegroup-security-tpm2.bbappend b/meta-phosphor/dynamic-layers/tpm-layer/recipes-core/packagegroups/packagegroup-security-tpm2.bbappend
index 06774b7..e9f1dc3 100644
--- a/meta-phosphor/dynamic-layers/tpm-layer/recipes-core/packagegroups/packagegroup-security-tpm2.bbappend
+++ b/meta-phosphor/dynamic-layers/tpm-layer/recipes-core/packagegroups/packagegroup-security-tpm2.bbappend
@@ -1,3 +1,5 @@
 # We don't need pkcs11 support on the BMC by default and it ends up causing a
 # dependency chain that brings in Rust.
 RDEPENDS:packagegroup-security-tpm2:remove = "tpm2-pkcs11"
+# Remove the python3 dependency.
+RDEPENDS:packagegroup-security-tpm2:remove = "python3-tpm2-pytss"