A nonimmigrant worker admitted to or permitted to remain in the United States under section 101(a)(15)(H)(2)(a) of the Immigration and Nationality Act . . . for agricultural labor or service shall be considered to be an alien described in section 101(a)(2) of such Act [a permanent resident alien] . . .for purposes of establishing eligibility for legal assistance under the Legal Services Corporation Act (42 U.S.C.