UPSTREAM: dm: spi: add BCM63xx HSSPI driver

This driver is a simplified version of linux/drivers/spi/spi-bcm63xx-hsspi.c

Change-Id: Ib6d47452d3699df5eb799cc0289687331192f380
Signed-off-by: Álvaro F

UPSTREAM: dm: spi: add BCM63xx HSSPI driver

This driver is a simplified version of linux/drivers/spi/spi-bcm63xx-hsspi.c

Change-Id: Ib6d47452d3699df5eb799cc0289687331192f380
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>
(cherry picked from commit 29cc4368ad4b8d67ae457681e9249e2008d6fee5)

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