remoteproc: core: Remove unused export of rproc_va_to_pa

Commit 086d08725d34 ("remoteproc: create vdev subdevice with specific dma
memory pool") added an export for rproc_va_to_pa. However, since its
introduction, this symbol has not been used by any loadable modules. It
remains only referenced within remoteproc_virtio.c, which is always built
together with remoteproc_core.c.

As such, exporting rproc_va_to_pa is unnecessary, so remove the export.

No functional changes.

Signed-off-by: Peng Fan <[e-mail]>
Acked-by: Andrew Davis <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Mathieu Poirier <[e-mail]>

drivers/remoteproc/remoteproc_core.c

···
 	WARN_ON(!virt_addr_valid(cpu_addr));
 	return virt_to_phys(cpu_addr);
 }
-EXPORT_SYMBOL(rproc_va_to_pa);
 
 /**
  * rproc_da_to_va() - lookup the kernel virtual address for a remoteproc address