Arm64/gas: add missing prereq features

A number of newer features are really SIMD or FP extensions, but don't
have this properly specified.

gas/config/tc-aarch64.c

@@ -10124,17 +10124,17 @@ static const struct aarch64_option_cpu_value_table aarch64_features[] = {
   {"rcpc",		AARCH64_FEATURE (AARCH64_FEATURE_RCPC, 0),
 			AARCH64_ARCH_NONE},
   {"dotprod",		AARCH64_FEATURE (AARCH64_FEATURE_DOTPROD, 0),
-			AARCH64_ARCH_NONE},
+			AARCH64_FEATURE (AARCH64_FEATURE_SIMD, 0)},
   {"sha2",		AARCH64_FEATURE (AARCH64_FEATURE_SHA2, 0),
-			AARCH64_ARCH_NONE},
+			AARCH64_FEATURE (AARCH64_FEATURE_FP, 0)},
   {"sb",		AARCH64_FEATURE (AARCH64_FEATURE_SB, 0),
 			AARCH64_ARCH_NONE},
   {"predres",		AARCH64_FEATURE (AARCH64_FEATURE_PREDRES, 0),
 			AARCH64_ARCH_NONE},
   {"aes",		AARCH64_FEATURE (AARCH64_FEATURE_AES, 0),
-			AARCH64_ARCH_NONE},
+			AARCH64_FEATURE (AARCH64_FEATURE_SIMD, 0)},
   {"sm4",		AARCH64_FEATURE (AARCH64_FEATURE_SM4, 0),
-			AARCH64_ARCH_NONE},
+			AARCH64_FEATURE (AARCH64_FEATURE_SIMD, 0)},
   {"sha3",		AARCH64_FEATURE (AARCH64_FEATURE_SHA3, 0),
 			AARCH64_FEATURE (AARCH64_FEATURE_SHA2, 0)},
   {"rng",		AARCH64_FEATURE (AARCH64_FEATURE_RNG, 0),
@@ -10168,9 +10168,9 @@ static const struct aarch64_option_cpu_value_table aarch64_features[] = {
 					 | AARCH64_FEATURE_SVE2
 					 | AARCH64_FEATURE_BFLOAT16, 0)},
   {"bf16",		AARCH64_FEATURE (AARCH64_FEATURE_BFLOAT16, 0),
-			AARCH64_ARCH_NONE},
+			AARCH64_FEATURE (AARCH64_FEATURE_FP, 0)},
   {"i8mm",		AARCH64_FEATURE (AARCH64_FEATURE_I8MM, 0),
-			AARCH64_ARCH_NONE},
+			AARCH64_FEATURE (AARCH64_FEATURE_SIMD, 0)},
   {"f32mm",		AARCH64_FEATURE (AARCH64_FEATURE_F32MM, 0),
 			AARCH64_FEATURE (AARCH64_FEATURE_SVE, 0)},
   {"f64mm",		AARCH64_FEATURE (AARCH64_FEATURE_F64MM, 0),