Config.in.legacy: remove BR2_PACKAGE_SYSTEMD_TMPFILES

When the BR2_PACKAGE_SYSTEMD_TMPFILES was removed, it was added to
Config.in. The idea was to warn users who use the symbol in their
br2-external.

However, most users don't have a br2-external that uses this symbol.
Since the symbol defaults to y when systemd is enabled, they'll get this
legacy warning - which is completely meaningless for them since nothing
changes.

The annoyance of the many is worse than the possible unexpected change
for the few. And anyone actually relying on BR2_PACKAGE_SYSTEMD_TMPFILES
will probably easily discover the issue in testing (e.g. because the
tmpfiles conf is missing in the target).

Therefore, remove BR2_PACKAGE_SYSTEMD_TMPFILES from Config.in.legacy.

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

Config.in.legacy

@@ -153,15 +153,6 @@ config BR2_PACKAGE_PYTHON_BACKPORTS_FUNCTOOLS_LRU_CACHE
 	  This package has been removed as python-setuptools-scm
 	  dropped support of python 2 since version 6.0.0.
 
-config BR2_PACKAGE_SYSTEMD_TMPFILES
-	bool "systemd tmpfiles support always enabled"
-	select BR2_LEGACY
-	help
-	  The systemd tmpfiles support is always enabled, so the symbol
-	  to make it optional has been removed. You need to update any
-	  external packages that use this symbol to use
-	  BR2_PACKAGE_SYSTEMD instead.
-
 config BR2_PACKAGE_CIVETWEB_WITH_LUA
 	bool "civetweb lua support option removed"
 	select BR2_LEGACY