MAINTAINERS: Drop bad F: from "Xilinx Zynq"

include/hw/misc/zynq_slcr.h never existed. Fixes: 246f530cdb (adc: Move the zynq-xadc file to the adc directories, 2021-05-18) Cc: Edgar E. Iglesias <edgar.iglesias@gmail.com> Cc: Alistair Francis <alistair@alistair23.me> Cc: Peter Maydell <peter.maydell@linaro.org> Cc: qemu-arm@nongnu.org Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-ID: <20260603064032.3733394-15-armbru@redhat.com> Reviewed-by: Alistair Francis <alistair@alistair23.me>