x86: Remove mod_table pass for MVexSIBMEM

When using MVexSIBMEM, OP_M will help check modrm. Thus, no need
to pass mod_table.

Since we have OP_M do the work, from now on, mod_table[] should
not gain any new entries, unless both slots of them are populated,
e.g., different modrm leading to different insns could not be
combined (Bad_Opcode is not the case since OP_M could handle that).

opcodes/ChangeLog:

	* i386-dis.c: Remove mod_table pass for MVexSIBMEM.