[PATCH] RISC-V: Fix testcases renamed test flag options

LGTM. juzhe.zh...@rivai.ai

[PATCH] RISC-V: Fix testcases renamed test flag options

Some testcases still had --param=riscv-autovec-preference=_, update to use -mrvv-vector-bits=_. Also add missing period in riscv.opt which caused a compiler driver error. gcc/ChangeLog: * config/riscv/riscv.opt: Add missing period gcc/testsuite/ChangeLog: * gcc.target/riscv/rvv/