99-kdump.conf: Omit nouveau module

Resolves: https://issues.redhat.com/browse/RHEL-52304

The nouveau module provides no significant utility in second kernel, and it
introduces firmware that occupies approximately 38MB of memory, which is
critical in the constrained environment of kdump. Omit it helps reduce memory
usage and optimize the crash recovery process.

Signed-off-by: Lichen Liu <lichliu@redhat.com>

99-kdump.conf

@@ -1,3 +1,3 @@
 dracutmodules=''
 add_dracutmodules=' kdumpbase '
-omit_dracutmodules=' rdma plymouth resume ifcfg earlykdump '
+omit_dracutmodules=' nouveau rdma plymouth resume ifcfg earlykdump '