Fix scratch memory alignment on GFX11

GFX11 requires scratch memory alignment of 256 Bytes instead of 1024.

Change-Id: I103de1c12f3a4877d7d36f13254301166c66e11f

runtime/hsa-runtime/core/inc/scratch_cache.h

@@ -95,6 +95,7 @@ class ScratchCache {
     uint32_t lanes_per_wave;
     uint32_t waves_per_group;
     uint64_t wanted_slots;
+    uint32_t mem_alignment_size;
     bool cooperative;
     ptrdiff_t queue_process_offset;
     bool large;