The KEBA I2C controller is only present on KEBA PLC devices.  Hence add
a dependency on KEBA_CP500, to prevent asking the user about this driver
when configuring a kernel without KEBA CP500 system FPGA support.
Fixes: c7e08c816cd2fdf8 ("i2c: keba: Add KEBA I2C controller support")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Gerhard Engleder <eg@keba.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
 config I2C_KEBA
        tristate "KEBA I2C controller support"
        depends on HAS_IOMEM
+       depends on KEBA_CP500 || COMPILE_TEST
        select AUXILIARY_BUS
        help
          This driver supports the I2C controller found in KEBA system FPGA