Yes, in a fair society it would be racial discrimination, but a few scholarships don't make up for a couple of centuries of oppression. Most scholarships are independent of race, and there are others that discriminate in other ways, I'm sure Maori specific scholarships are only a few percentage of all scholarships on offer.
Unfortunately we're still stuck with petty tribal/herding instincts. Even if not consciously racist, we subconsciously prefer to have people around us who are the same as us.
You're quite right, our system is designed to benefit the top 1%, most wealth is inherited, and someone born to a wealthy family but makes all the wrong decisions in life is statistically more likely to come out ahead of people who are born poor and make all the right decisions.
The way I see it, there are two issues at play here:
The first is that our society is built on thousands of years of European and Christian culture, it's completely foreign and ignorant of what people of other cultures want and need, therefore other people are forced to give up who they are and make an effort to fit in with us if they want to succeed.
The second is that the 1% who are in power are usually white and male and either consciously or subconsciously prefer to give scholarships to, promote, or hire people of their own ethnicity and class. It's natural to want to spend time with people like you and racial discrimination doesn't have to mean actually being racist. This means that people from minority groups have to be much better than their white counterparts to get the same opportunities.
Statistics clearly show that women or minorities with the same or better education, experience, skills, etc. get paid worse and are less likely to be promoted than their white male counterparts. There are always exceptions, but there are exceptions with every trend.
By giving opportunities based on race, gender, sexuality, etc. people are trying to get past those barriers which are intrinsic to our culture, in the future we're we've moved on from such nonsence and Maori don't make up the bulk of the prison population or poverty statistics and are statistically as likely to succeed as a white person, then we can drop these sorts of things.