MAINTAINERS: omap1: Add Janusz as an additional maintainer

Janusz has been active with improving and testing the omap1 SoC support
and has been recently working on adding support for the common clock
framework.

Cc: Arnd Bergmann <arnd@arndb.de>
Acked-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Acked-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Message-Id: <20220413081656.27848-1-tony@atomide.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>