[BPF] Do not allow gotol in the middle of asm insn (#144545)

Previously I accidentally allowed 'gotol' insn in the middle of asm insn
([1]). But actually 'gotol' is not allowed in the middle of any asm
insn, so remove it from isValidIdInMiddle().

[1] yonghong-song@6c412b6

Author: yonghong-song

llvm/lib/Target/BPF/AsmParser/BPFAsmParser.cpp

@@ -261,7 +261,6 @@ struct BPFOperand : public MCParsedAsmOperand {
         .Case("bswap32", true)
         .Case("bswap64", true)
         .Case("goto", true)
-        .Case("gotol", true)
         .Case("ll", true)
         .Case("skb", true)
         .Case("s", true)