AIA: Enable Smcsrind/Sscsrind if supporting Smaia/Ssaia

Smaia/Ssaia allocates indirect CSRs 0x30~0x3f for major interrupt
priorities and 0x70~0xff for external interrupts (only with an IMSIC).

disasm/isa_parser.cc

@@ -389,8 +389,11 @@ isa_parser_t::isa_parser_t(const char* str, const char *priv)
     } else if (ext_str == "smaia") {
       extension_table[EXT_SMAIA] = true;
       extension_table[EXT_SSAIA] = true;
+      extension_table[EXT_SMCSRIND] = true;
+      extension_table[EXT_SSCSRIND] = true;
     } else if (ext_str == "ssaia") {
       extension_table[EXT_SSAIA] = true;
+      extension_table[EXT_SSCSRIND] = true;
     } else if (ext_str[0] == 'x') {
       extension_table['X'] = true;
       if (ext_str.size() == 1) {