CORE-V: Fix typo in mac/msu tests

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/cv-march-xcvmac-test-autogeneration-mac.c:
	Replace -02 with -O2.
	* gcc.target/riscv/cv-march-xcvmac-test-autogeneration-msu.c:
	Likewise.