latest

target/riscv: new `ebreak` controls

* Deprecate `riscv set_ebreak*` commands.
* Introduce RISC-V-sepecific `configure` parameter `-ebreak` instead.
* Separate controls for VS and VU modes.

Change-Id: I0ff88318dcb52af6923eb9f20f9d0c056ad09cf0
Signed-off-by: Evgeniy Naydanov <evgeniy.naydanov@syntacore.com>