target/riscv: Enable bitmanip Zb[abcs] instructions

The bitmanip extension has now been ratified [1] and upstream tooling
(gcc/binutils) support it too, so move them out of experimental and also
enable by default (for better test exposure/coverage)

[1] https://wiki.riscv.org/display/TECH/Recently+Ratified+Extensions

Signed-off-by: Vineet Gupta <vineetg@rivosinc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20211216051844.3921088-1-vineetg@rivosinc.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

target/riscv/cpu.c

@@ -641,10 +641,10 @@ static Property riscv_cpu_properties[] = {
     DEFINE_PROP_UINT16("elen", RISCVCPU, cfg.elen, 64),
 
     /* These are experimental so mark with 'x-' */
-    DEFINE_PROP_BOOL("x-zba", RISCVCPU, cfg.ext_zba, false),
-    DEFINE_PROP_BOOL("x-zbb", RISCVCPU, cfg.ext_zbb, false),
-    DEFINE_PROP_BOOL("x-zbc", RISCVCPU, cfg.ext_zbc, false),
-    DEFINE_PROP_BOOL("x-zbs", RISCVCPU, cfg.ext_zbs, false),
+    DEFINE_PROP_BOOL("zba", RISCVCPU, cfg.ext_zba, true),
+    DEFINE_PROP_BOOL("zbb", RISCVCPU, cfg.ext_zbb, true),
+    DEFINE_PROP_BOOL("zbc", RISCVCPU, cfg.ext_zbc, true),
+    DEFINE_PROP_BOOL("zbs", RISCVCPU, cfg.ext_zbs, true),
     DEFINE_PROP_BOOL("x-h", RISCVCPU, cfg.ext_h, false),
     DEFINE_PROP_BOOL("x-j", RISCVCPU, cfg.ext_j, false),
     /* ePMP 0.9.3 */