target/riscv: Use 32 bits for misa extensions

uint32_t is already in use in most places storing misa extensions such
as CPUArchState::misa_exts, RISCVCPUProfile::misa_exts,
RISCVImpliedExtsRule::implied_misa_exts.  Additionally. the field is
already migrated as uint32_t.

Signed-off-by: Anton Johansson <anjo@rev.ng>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Message-ID: <20251001073306.28573-2-anjo@rev.ng>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

target/riscv/cpu.h

@@ -50,7 +50,7 @@ typedef struct CPUArchState CPURISCVState;
  */
 #define RISCV_UW2_ALWAYS_STORE_AMO 1
 
-#define RV(x) ((target_ulong)1 << (x - 'A'))
+#define RV(x) BIT(x - 'A')
 
 /*
  * Update misa_bits[], misa_ext_info_arr[] and misa_ext_cfgs[]
@@ -582,7 +582,7 @@ struct RISCVCPUClass {
     RISCVCPUDef *def;
 };
 
-static inline int riscv_has_ext(CPURISCVState *env, target_ulong ext)
+static inline int riscv_has_ext(CPURISCVState *env, uint32_t ext)
 {
     return (env->misa_ext & ext) != 0;
 }