semihosting: Fix typo in semihost_rename
semihosting: Fix typo in semihost_rename

Fix typo in semihost_rename. Now it actually sends the `new_name` as well as the `old_name`.
mbedmicro/mbed,mbedmicro/mbed,mbedmicro/mbed,mbedmicro/mbed,mbedmicro/mbed