arch/z80/src/ez80/Toolchain.defs: Update some CFLAGS to match CFLAGS from ZDS-II IDE. Apparently, we must say that the CPU is an eZ80F91 event when compiler for eZ80F92. boards/z80/ez80/z20x: Update linker scripts.
The Z20X is a simple expandable DIY computing system, built around the eZ80 microprocessor. Reference: https://z20x.computer