99-kdump.conf: Omit nouveau and amdgpu module

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

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

See also:
https://access.redhat.com/solutions/6977793
https://access.redhat.com/solutions/7100186

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

99-kdump.conf

@@ -1,3 +1,4 @@
 dracutmodules=''
 add_dracutmodules=' kdumpbase '
 omit_dracutmodules=' rdma plymouth resume ifcfg earlykdump '
+omit_drivers+=' nouveau amdgpu '