arm64/kexec: Fix missing extra range for crashkres_low.

Like crashk_res, Calling crash_exclude_mem_range function with
crashk_low_res area would need extra crash_mem range too.

Add one more extra cmem slot in case of crashk_low_res is used.
Signed-off-by: NLevi Yun <ppbuk5246@gmail.com>
Fixes: 944a45ab ("arm64: kdump: Reimplement crashkernel=X")
Cc: <stable@vger.kernel.org> # 5.19.x
Acked-by: NBaoquan He <bhe@redhat.com>
Reviewed-by: NCatalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20220831103913.12661-1-ppbuk5246@gmail.comSigned-off-by: NWill Deacon <will@kernel.org>

arch/arm64/kernel/machine_kexec_file.c

@@ -47,7 +47,7 @@ static int prepare_elf_headers(void **addr, unsigned long *sz)
 	u64 i;
 	phys_addr_t start, end;
 
-	nr_ranges = 1; /* for exclusion of crashkernel region */
+	nr_ranges = 2; /* for exclusion of crashkernel region */
 	for_each_mem_range(i, &start, &end)
 		nr_ranges++;