MAINTAINERS: fix style in RESET CONTROLLER FRAMEWORK

Commit 37859277 ("MAINTAINERS: add reset controller framework
keywords") slips in some formatting with spaces instead of tabs, which
./scripts/checkpatch.pl -f MAINTAINERS complains about:

  WARNING: MAINTAINERS entries use one tab after TYPE:
  #14047: FILE: MAINTAINERS:14047:
  +K:      \b(?:devm_|of_)?reset_control(?:ler_[a-z]+|_[a-z_]+)?\b

Fixes: 37859277 ("MAINTAINERS: add reset controller framework keywords")
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>