[lldb][NFC] Silence missing case warnings in TypeSystemClang::GetTypeBitAlign due to new RISC-V V types

Those types were added in D92715. This just silences the warning but doesn't
actually add support for those types to LLDB.

GitOrigin-RevId: fb1dc77bfd24c32a5231face77e0bc4323b67c68
1 file changed