arm64: defconfig: Enable RZ/G2L MIPI CSI-2 and CRU support

Increase build and test coverage by enabling support for the Renesas
RZ/G2L MIPI CSI-2 Receiver and the RZ/G2L Camera Receiving Unit, as used
on the RZ/G2L SMARC EVK development board.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/32098bf6a5e78a4bcc6398ccb5db0b01f1afc9b9.1672747428.git.geert+renesas@glider.be