RISC-V: Add Types to Un-Typed Sync Instructions:

RISC-V: Add Types to Un-Typed Sync Instructions:

Updates the sync instructions to ensure that no insn is left without
a type attribute. Updates a total of 9 insns to have type "atomic"
or type "multi" based on number of assembly instructions generated

Tested for regressions using rv32/64 multilib with newlib/linux.

gcc/Changelog:

	* config/riscv/sync-rvwmo.md: updated types to "multi" or
		"atomic" based on number of assembly lines generated
	* config/riscv/sync-ztso.md: likewise
	* config/riscv/sync.md: likewise

Reviewed-by: Jeff Law <jlaw@ventanamicro.com>
Signed-off-by: Edwin Lu <ewlu@rivosinc.com>