Maybe you are having a bit of fun with us. Such a GPA from a top 20 school is pretty impressive. I'm wondering why you are applying for an MS and not a doctorate. I'd guess the chances of one are about the same as the other.
But since you are asking about a very narrow range of schools, it is impossible what you can say or do to make acceptance assured. Only their admissions system (likely a committee of faculty) can determine that. I'd suggest you apply a few other places as well.
However, the SoP is not the place to try to make excuses, no matter how unnecessary (or necessary) they might be. The SoP is a forward looking document detailing as best you can your plans for the future, both study and afterwards. Don't waste words there that can actually be better focused and contribute more if done correctly.
I'd suggest you ignore your GPA altogether in your application materials. Graduate admissions in US is broad based, not narrow. And, especially, not especially heavily dependent on GPA. Your letters of recommendation are more important.
And, TBH, I'd worry a bit about a student with perfect scores. I'd wonder whether they ever needed to work hard at things (some people would, others not). And so I'd worry whether they would hit a wall when grad study suddenly proves harder than what they have experienced before. I'm not suggesting that this applies to you, but it might run through the minds of some admissions people.
You should be fine for study, generally, but I'd cast a wider net than just UCB and MIT and wider still to consider a doctorate.