ARM: bcm2835_defconfig: add support for Raspberry Pi4

Add drivers needed to boot Raspberry Pi4 board.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/20200217155506.5245-1-m.szyprowski@samsung.com


Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>