riscv: mm: init: remove unnecessary "#ifdef CONFIG_CRASH_DUMP"

The is_kdump_kernel() returns false for !CRASH_DUMP case, so we don't
need the #ifdef CONFIG_CRASH_DUMP for is_kdump_kernel() checking.
Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Reviewed-by: Alexandre Ghiti <alex@ghiti.fr>
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

arch/riscv/mm/init.c

@@ -791,12 +791,10 @@ static void __init reserve_crashkernel(void)
 	 * since it doesn't make much sense and we have limited memory
 	 * resources.
 	 */
-#ifdef CONFIG_CRASH_DUMP
 	if (is_kdump_kernel()) {
 		pr_info("crashkernel: ignoring reservation request\n");
 		return;
 	}
-#endif
 
 	ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
 				&crash_size, &crash_base);