RTEMS | riscv: add helper functions (!1239)

[Kinsey Moore (@opticron)]

Kinsey Moore started a new discussion on cpukit/score/cpu/riscv/include/rtems/score/riscv-utility.h: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1239#note_149897

 > +  __asm__ volatile ( "fence " #pred ", " #succ : : : "memory" )
 > +
 > +static inline void _RISCV_data_barrier( void )
 > +{
 > +  _RISCV_FENCE( rw, rw );
 > +}
 > +
 > +static inline void _RISCV_MMIO_store_release_fence( void )
 > +{
 > +  _RISCV_FENCE( o, i );
 > +}
 > +
 > +#if defined(RISCV_USE_S_MODE)
 > +static inline void _RISCV_TLB_flush_all_entries( void )
 > +{
 > +  __asm__ volatile ( "sfence.vma zero, zero" );

Since the `rw, rw` fences are getting reworked above, this can also use the same macro that it uses.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1239#note_149897
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