proc riscv is not sufficient to deprecate riscv commands

[en-sc]

src/target/riscv/startup.tcl is intended to rewrite deprecated RISC-V-specific commands in TCL.
Such commands include a space in the name (e.g. riscv set_enable_virtual ...). By default TCL will interpret riscv set_enable_virtual ...) as a call to riscv with a first argument set_enable_virtual. To work around this proc riscv is introduced. See https://sourceforge.net/p/openocd/tickets/434/.

riscv-openocd/src/target/riscv/startup.tcl

Lines 53 to 55 in 88fe568

	proc riscv {cmd args} {
	tailcall "riscv $cmd" {*}$args
	}

However, this is still not enough to cover the case <target_name> riscv set_enable_virtual ....