vulkan: add iq4_nl support back to FA (#24585)

* vulkan: add iq4_nl support back to FA

I was originally concerned about wasting shared memory on the LUT, but it's small
and unlikely to matter in practice.

Also support q1_0 for non-coopmat2.

Fixes #23681

* remove q1_0 FA support

ggml/src/ggml-vulkan/vulkan-shaders/flash_attn_cm1.comp

@@ -64,7 +64,9 @@ shared ACC_TYPE slope[Br];
 
 void main() {
 #ifdef NEEDS_INIT_IQ_SHMEM
-    init_iq_shmem(gl_WorkGroupSize);
+    if (fa_type_needs_shmem(FaTypeK) || fa_type_needs_shmem(FaTypeV)) {
+        init_iq_shmem(gl_WorkGroupSize);
+    }
 #endif
 
     init_indices();