In all deeds of trust made prior to March 15, 1941, wherein property has been conveyed to corporations as trustees to secure indebtedness, the appointment of said corporations as trustees, the conveyances to said corporate trustees, and the action taken under the powers of such deeds of trust by said corporate trustees are hereby confirmed and validated to the same extent as if such corporate trustees had been individual trustees. (1941, c. 245, s. 1.)