classes: Drop now unneeded umask flags

Now that 022 is the default in BB_DEFAULT_UMASK in bitbake.conf, we
don't need any of these task flags, clean up.

(From OE-Core rev: 816fca781943a7dbf40391d9db34c7bf12711962)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/patch.bbclass

@@ -160,7 +160,6 @@ python patch_do_patch() {
 patch_do_patch[vardepsexclude] = "PATCHRESOLVE"
 
 addtask patch after do_unpack
-do_patch[umask] = "022"
 do_patch[dirs] = "${WORKDIR}"
 do_patch[depends] = "${PATCHDEPENDENCY}"