RISC-V: Fix sync.md and riscv.cc whitespace errors

RISC-V: Fix sync.md and riscv.cc whitespace errors

This patch fixes whitespace errors introduced with
https://gcc.gnu.org/pipermail/gcc-patches/2023-April/616807.html

2023-04-26 Patrick O'Neill <patrick@rivosinc.com>

gcc/ChangeLog:

	* config/riscv/riscv.cc: Fix whitespace.
	* config/riscv/sync.md: Fix whitespace.

Signed-off-by: Patrick O'Neill <patrick@rivosinc.com>