change default risv-gcc to riscv-none-elf- and add _zicsr extension

add cmake for ch32v20x, skip freertos examples for CH32V20X, also skip net webserver due to lack of RAM
update to use openocd with wlinke adapter

hw/bsp/fomu/family.mk

@@ -1,9 +1,5 @@
-# Toolchain from https://github.com/xpack-dev-tools/riscv-none-embed-gcc-xpack
-CROSS_COMPILE = riscv-none-embed-
-
 # Toolchain from https://github.com/xpack-dev-tools/riscv-none-elf-gcc-xpack
-# CROSS_COMPILE = riscv-none-elf-
-#  -march=rv32i_zicsr
+CROSS_COMPILE = riscv-none-elf-
 
 CPU_CORE ?= rv32i-ilp32