No, you would not need to enter it there because as you said, the deduction was not disallowed. The standard deduction was more than your itemized deductions and your federal mortgage interest deduction amount was not affected by the new law.
That question is asking about only the interest that was disallowed on your federal return, such as:
- mortgage interest on debt over $750K but less than $1M (and this only applies to mortgages with origination dates after 12/14/2017) and/or
- interest on home-equity debt where you used the money for things other than buying, building or substantially improving your home.
The interest that falls into one of these 2 categories would be disallowed on your federal return, and therefore reportable as an adjustment on your CA return. There would have been the opposite adjustment taken on your federal return to justify the CA state adjustment.
