[SYCL][NFC] Add REQUIRES: cuda to CUDA test (#19583)

This change adds `REQUIRES: cuda` to the `cmath-fallback-ld.cpp` test
since it uses the CUDA target.

---------

Signed-off-by: Michael Aziz <[email protected]>
Co-authored-by: Alexey Bader <[email protected]>

Author: 0x12CC

sycl/test/check_device_code/math-builtins/cmath-fallback-ld.cpp

@@ -1,6 +1,7 @@
 // Note: This isn't really target specific and should be switched to spir when
 // it's enabled for it.
 
+// REQUIRES: cuda
 // RUN: %clang -fsycl -fsyntax-only -fsycl-targets=nvptx64-nvidia-cuda -nocudalib %s
 
 // Check that mixed calls with long double don't cause compile errors on the