graphics: Delete drm-current-kmod and drm-devel-kmod

For now please use drm-510-kmod and if you have problems with it
please use drm-54-kmod and open a issue on https://github.com/freebsd/drm-kmod

Sponsored by:	Beckhoff Automation GmbH & Co. KG

MOVED

@@ -17144,3 +17144,5 @@ security/pinentry-gnome3|security/pinentry-gnome|2022-04-30|De-versioned due to
 www/shttpd||2022-04-30|Has expired: Abandonware, last release over 12+ years ago
 mail/p5-Email-Sender-Transport-SMTPS|mail/p5-Email-Sender|2022-04-30|Has expired: Deprecated by upstream. Use Email::Sender::Transport::SMTP in mail/p5-Email-Sender instead
 net/gogoc||2022-04-30|Has expired: Services were discontinued in 2016
+graphics/drm-current-kmod||2022-05-01|Switched to a Linux version based naming scheme. Use graphics/drm-510-kmod
+graphics/drm-devel-kmod||2022-05-01|Switched to a Linux version based naming scheme. Use graphics/drm-510-kmod

graphics/Makefile

@@ -141,8 +141,6 @@
     SUBDIR += drawpile
     SUBDIR += drm-54-kmod
     SUBDIR += drm-510-kmod
-    SUBDIR += drm-current-kmod
-    SUBDIR += drm-devel-kmod
     SUBDIR += drm-fbsd12.0-kmod
     SUBDIR += drm-fbsd13-kmod
     SUBDIR += drm-kmod