i2c: cadence: allow COMPILE_TEST

Driver builds fine with COMPILE_TEST. Enable it for wider test coverage
and easier maintenance.

Signed-off-by: Wolfram Sang <wsa@kernel.org>
Acked-by: Michal Simek <michal.simek@xilinx.com>

drivers/i2c/busses/Kconfig

@@ -488,7 +488,7 @@ config I2C_BRCMSTB
 
 config I2C_CADENCE
 	tristate "Cadence I2C Controller"
-	depends on ARCH_ZYNQ || ARM64 || XTENSA
+	depends on ARCH_ZYNQ || ARM64 || XTENSA || COMPILE_TEST
 	help
 	  Say yes here to select Cadence I2C Host Controller. This controller is
 	  e.g. used by Xilinx Zynq.