riscv: Fix up Copyright lines [PR108413]

These 2 files had incorrectly formatted Copyright lines (no space between
Copyright and (C)) which makes update-copyright.py upset.

2023-01-16  Jakub Jelinek  <jakub@redhat.com>

	PR other/108413
	* config/riscv/riscv-vsetvl.h: Add space in between Copyright and (C).
	* config/riscv/riscv-vsetvl.cc: Likewise.