Add SPIBSC clock for RZ/A2.
Signed-off-by: NChris Brandt <chris.brandt@renesas.com>
Link: https://lore.kernel.org/r/20191206134202.18784-4-chris.brandt@renesas.comSigned-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>