Reimplement the procedure chain stacks hardware top

[numas13]

@numas13 from old repo

In Embox, writing to controls registers is done before writing to procedure stack pointers registers. Currently qemu-e2k have no hardware tops for the stacks and the last write to the control registers is lost after writing to PCSP. It is unknown whether this is a bug due to the lack of ISA specification for the E2K architecture. It is assumed that reimplementation of stacks hardware tops is requred for the system emulation.

• Add PCSHTP register.
• Implement procedure chain stack hardware top.
• Rework read/write to the control registers.
• Rework procedure calls.
• Rework stack manupulation syscalls.

The minimum required size is unknown for PCSHT, but one set of CRs will be enough to solve the problem.