[HIP] Fix HIP rounding math intrinsics

The __ocml_*_rte_f32 and __ocml_*_rte_f64 functions are not
available if OCML_BASIC_ROUNDED_OPERATIONS is not defined.

Reviewed By: b-sumner, yaxunl

Fixes: SWDEV-257235

Differential Revision: https://reviews.llvm.org/D89966