MAINTAINER: Add entry for Blaize SoC

MAINTAINER: Add entry for Blaize SoC

Add MAINTAINERS entry for Blaize SoC platform with a list of
maintainers.

Signed-off-by: Nikolaos Pasaloukos <nikolaos.pasaloukos@blaize.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Matt Redfearn <matt.redfearn@blaize.com>
Acked-by: James Cowgill <james.cowgill@blaize.com>
Acked-by: Neil Jones <neil.jones@blaize.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>