media: MAINTAINERS: Change s5p-jpeg maintainer information.

My @samsung.com address is going to cease existing soon, so change it to
an address which can actually be used to contact me.

Adding Sylwester Nawrocki, who still has access to a wide spectrum
of Exynos-based hardware.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>