crash: remove an unused argument from reserve_crashkernel_generic()

crash: remove an unused argument from reserve_crashkernel_generic()

cmdline argument is not used in reserve_crashkernel_generic() so remove
it.  Correspondingly, all the callers have been updated as well.

No functional change intended.

Link: https://lkml.kernel.org/r/20250131113830.925179-3-sourabhjain@linux.ibm.com
Signed-off-by: Sourabh Jain <sourabhjain@linux.ibm.com>
Acked-by: Hari Bathini <hbathini@linux.ibm.com>
Acked-by: Baoquan He <bhe@redhat.com>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Mahesh Salgaonkar <mahesh@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>