target/riscv: rename ext_icsr to ext_zicsr

Add a leading 'z' to improve grepping. When one wants to search for uses
of zicsr they're more likely to do 'grep -i zicsr' than 'grep -i icsr'.

Suggested-by: Andrew Jones <ajones@ventanamicro.com>
Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Message-ID: <20231012164604.398496-3-dbarboza@ventanamicro.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

target/riscv/cpu_cfg.h

@@ -62,7 +62,7 @@ struct RISCVCPUConfig {
     bool ext_zksh;
     bool ext_zkt;
     bool ext_zifencei;
-    bool ext_icsr;
+    bool ext_zicsr;
     bool ext_icbom;
     bool ext_icboz;
     bool ext_zicond;