[SYCL] Enable sub_group_size_prop on HIP (#1337)

The sub_group_size_prop test was unintentionally disabled for HIP. This
commit enables the test for HIP.

Signed-off-by: Larsen, Steffen <[email protected]>

Author: steffenlarsen

SYCL/Basic/sub_group_size_prop.cpp

@@ -2,9 +2,6 @@
 // RUN: %CPU_RUN_PLACEHOLDER %t.out
 // RUN: %GPU_RUN_PLACEHOLDER %t.out
 // RUN: %ACC_RUN_PLACEHOLDER %t.out
-//
-// Failing negative test with HIP
-// XFAIL: hip
 
 #include <sycl/sycl.hpp>