SPI flash require 8 dummy clock cycle during read operation
before it can receive the data. However, this might not needed
by other SPI device such as SD card when operate in SPI mode.
Thus, a new device tree property called 'dummy-cycle' is added
to resolve this issue. This optional device tree property is
needed for controlling the SPI flash device.
Signed-off-by: Mohamad Noor Alim Hussin <mnalim@efinixinc.com>
