Revert: [AArch64] MTE corefile support

[Luis Machado]

Hi,

I'd like to revert commit 894982bfccec66a1496785bbef4d46423345b8c8 for 
both master binutils-gdb and binutils 2.37.

The kernel developers would like to discuss the ABI further in lkml 
before making a decision about what the MTE corefile format will look like.

Given nobody is using these two constants yet (NT_MEMTAG and 
NT_MEMTAG_TYPE_AARCH_MTE), I think this won't be harmful.

GDB 11 hasn't released yet, and I plan to drop these constants from that 
branch as well.

OK?
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