Fix invalid alignment value for _aligned_malloc in Windows (#2671)

The Device Maximum Alignment is set up to zero when using the USM
wrapper to allocate a System type allocation.
This value is used for the `alignment` param in the `_aligned_malloc`
function if the test is run on Windows. In this case, `alignment` must
be a power of 2
[_aligned_malloc](https://learn.microsoft.com/en-us/cpp/c-runtime-library/reference/aligned-malloc?view=msvc-170)
:

> If alignment isn't a power of 2 or size is zero, this function invokes
the invalid parameter handler, as described in [Parameter
validation](https://learn.microsoft.com/en-us/cpp/c-runtime-library/parameter-validation?view=msvc-170).

test_conformance/SVM/unified_svm_fixture.h

@@ -94,8 +94,10 @@ public:
             else
             {
                 // For now, just unconditionally align to the device maximum
-                data = static_cast<T*>(
-                    align_malloc(count * sizeof(T), deviceMaxAlignment));
+                const auto alignment =
+                    deviceMaxAlignment ? deviceMaxAlignment : 1;
+                data =
+                    static_cast<T*>(align_malloc(count * sizeof(T), alignment));
                 test_assert_error_ret(data != nullptr,
                                       "Failed to allocate memory",
                                       CL_OUT_OF_RESOURCES);