Short answer: Probably not. It would cost too much to administer the mortgage. It would be easier to increase your existing mortgage with a financial institution and role your line of credit into the mortgage.
The exception: If you own a home that has a mortgage with less than 75% of the value of the home left on it and you have an RRSP with more than $30,000 this might be an option.
In theory getting a mortgage from your RRSP might sound like a good idea and technically you can take out a mortgage from your RRSP on a house you are going to buy or on a house you already own. However, the fees associated with administering a self directed RRSP with a mortgage (100-300/year), and the mortgage default insurance (mandatory if you are lending to yourself and ranging from .5 to 2% annually) usually outweigh the benefits gained.
The break even point of taking out an RRSP mortgage is around 30,000$, the mortgage must be administered by a trustee approved under the National Housing Act (TD Waterhouse, Canadian Western Trust, ect), and must be held in a self directed RRSP. These qualifications make RRSP mortgages useful only in very specific situations.