wwan: iosm: use a flexible array rather than allocate short objects

GCC array-bounds warns that ipc_coredump_get_list() under-allocates
the size of struct iosm_cd_table *cd_table.

This is avoidable - we just need a flexible array. Nothing calls
sizeof() on struct iosm_cd_list or anything that contains it.
Reviewed-by: M Chetan Kumar <m.chetan.kumar@intel.com>
Link: https://lore.kernel.org/r/20220520060013.2309497-1-kuba@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/wwan/iosm/iosm_ipc_coredump.h

@@ -14,9 +14,6 @@
 /* Max buffer allocated to receive coredump data */
 #define MAX_DATA_SIZE 0x00010000
 
-/* Max number of file entries */
-#define MAX_NOF_ENTRY 256
-
 /* Max length */
 #define MAX_SIZE_LEN 32
 
@@ -38,7 +35,7 @@ struct iosm_cd_list_entry {
  */
 struct iosm_cd_list {
 	__le32 num_entries;
-	struct iosm_cd_list_entry entry[MAX_NOF_ENTRY];
+	struct iosm_cd_list_entry entry[];
 } __packed;
 
 /**