Treat Mageia "nokmsboot" the same way as "nomodeset" in:
https://github.com/systemd/systemd-stable/commit/c1f8ff8d0de7e303b8004b02a0a47d4cc103a7f8

Signed-off-by: Thomas Backlund <tmb@mageia.org>

diff -Nurp systemd-251.orig/rules.d/71-seat.rules.in systemd-251/rules.d/71-seat.rules.in
--- systemd-251.orig/rules.d/71-seat.rules.in	2022-05-21 16:23:41.000000000 +0300
+++ systemd-251/rules.d/71-seat.rules.in	2022-05-22 00:12:48.019508771 +0300
@@ -20,6 +20,8 @@ SUBSYSTEM=="backlight", TAG+="seat"
 
 # Allow efifb / uvesafb to be a master if KMS is disabled
 SUBSYSTEM=="graphics", KERNEL=="fb[0-9]", IMPORT{cmdline}="nomodeset", TAG+="master-of-seat"
+# Mageia specific
+SUBSYSTEM=="graphics", KERNEL=="fb[0-9]", IMPORT{cmdline}="nokmsboot", TAG+="master-of-seat"
 
 # Allow any PCI graphics device to be a master and synthesize a seat if KMS
 # is disabled and the kernel doesn't have a driver that would work with this device.