anv: remove anv_reloc_list->array_length

This is another field that, after the recent commits, became unused.
It's either zero-initialized (by the memset) or copy-initialized
(which means it's also zero). And it never even gets used anywhere
anyway, so even if the value was non-zero it wouldn't matter.

Reviewed-by: Ivan Briano <ivan.briano@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20309>

src/intel/vulkan/anv_private.h

@@ -1394,7 +1394,6 @@ void anv_vma_free(struct anv_device *device,
                   uint64_t address, uint64_t size);
 
 struct anv_reloc_list {
-   uint32_t                                     array_length;
    uint32_t                                     dep_words;
    BITSET_WORD *                                deps;
 };