MAINTAINERS: use "T: git" and whitespace trivia

Add missing git as a prefix for git repositories in the few places it
wasn't already used.

Convert a space delimiter to a tab.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>