UPSTREAM: spi: Kconfig: Create ISSI Kconfig entry

Add ISSI to Kconfig to make it selectable via menuconfig.
Also convert all current platforms.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>

UPSTREAM: spi: Kconfig: Create ISSI Kconfig entry

Add ISSI to Kconfig to make it selectable via menuconfig.
Also convert all current platforms.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Change-Id: I623a8e29359455055f7d20ad60bb8972846bec6e
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>
(cherry picked from commit 13f451bf5625e222e881779e69d92a2002e41dfc)

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