UPSTREAM: dm: spi: add BCM63xx SPI driver

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

Change-Id: I2a36ddc619bc5801fe6f9f9873a63d8e6d62534f
Signed-off-by: Álvaro Fernández

UPSTREAM: dm: spi: add BCM63xx SPI driver

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

Change-Id: I2a36ddc619bc5801fe6f9f9873a63d8e6d62534f
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 5ac07d2969e7f1ea2582f97ccacbe9ad9c9d62fc)

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