RISC-V: Fix format issue for trailing operator [NFC]

RISC-V: Fix format issue for trailing operator [NFC]

This patch would like to fix below format issue of trailing operator.

=== ERROR type #1: trailing operator (4 error(s)) ===
gcc/config/riscv/riscv-vector-builtins.cc:4641:39:  if ((exts &
RVV_REQUIRE_ELEN_FP_16) &&
gcc/config/riscv/riscv-vector-builtins.cc:4651:39:  if ((exts &
RVV_REQUIRE_ELEN_FP_32) &&
gcc/config/riscv/riscv-vector-builtins.cc:4661:39:  if ((exts &
RVV_REQUIRE_ELEN_FP_64) &&
gcc/config/riscv/riscv-vector-builtins.cc:4670:36:  if ((exts &
RVV_REQUIRE_ELEN_64) &&

Passed the ./contrib/check_GNU_style.sh for this patch,  and double
checked there is no other format issue of the original patch.

Committed as format change.

gcc/ChangeLog:

	* config/riscv/riscv-vector-builtins.cc
	(validate_instance_type_required_extensions): Remove the
	operator from the trailing and put it to new line.

Signed-off-by: Pan Li <pan2.li@intel.com>