debug: fix HwbpManual test

HwbpManual test was broken:

Value read back from tselect was compared with tdata1 value. https://github.com/riscv-software-src/riscv-tests/blob/408e461da11e0b298c4b69e587729532787212f5/debug/gdbserver.py#L701-L703 This resulted in the test being reported as not supported, after all the triggers were checked.
tdata1.type field was not set to mcontrol.
tselect value used to be changed by handle_reset and not restored. https://github.com/riscv-software-src/riscv-tests/blob/408e461da11e0b298c4b69e587729532787212f5/debug/programs/entry.S#L79-L84
Manual breakpoint used to be left behind.

riscv-software-src / riscv-tests