Parameterize Zicntr and Xif features

Created by: halfdan-dolva

Parameterized Zicntr only registers. Parameterized speculative reads for Xif.

LEC clean with ZICNTR=1'b1 and X_EXT=1'b1.

Logically equivalent to cv32e40s with all core exclusive features disabled (ZICNTR=1'b0, X_EXT=1'b0, etc.).