Fix Build Warnings for AArch64 (#2242)

This commit links to issue (#2234).

When cross-compiling for AArch64, using gcc 13.3, you encounter three
warnings types that turn into errors:

- maybe-uninitialized
- stringop-truncation
- strict-aliasing

This commit fixes all the warnings found, in regards to the first two
rules. To resolve the warnigns due to strict-aliasing, I am editing the
CMake build system.

Signed-off-by: Antonios Christidis <a-christidis@ti.com>

test_conformance/basic/test_imagereadwrite.cpp

@@ -314,6 +314,12 @@ test_imagereadwrite(cl_device_id device, cl_context context, cl_command_queue qu
                 }
                 outp = (void *)rgbafp_outptr;
                 break;
+            default:
+                log_error("ERROR Invalid j = %d\n", j);
+                elem_size = 0;
+                p = nullptr;
+                outp = nullptr;
+                break;
         }
 
         const char* update_packed_pitch_name = "";

test_conformance/basic/test_imagereadwrite3d.cpp

@@ -320,6 +320,12 @@ test_imagereadwrite3d(cl_device_id device, cl_context context, cl_command_queue
                 }
                 outp = (void *)rgbafp_outptr;
                 break;
+            default:
+                log_error("ERROR Invalid j = %d\n", j);
+                elem_size = 0;
+                p = nullptr;
+                outp = nullptr;
+                break;
         }
 
         const char* update_packed_pitch_name = "";