crypto: xilinx - Turn SHA into a tristate and allow COMPILE_TEST

This patch turns the new SHA driver into a tristate and also allows
compile testing.

Signed-off-by: Herbert Xu <[e-mail]>

drivers/crypto/Kconfig

···
 	  for AES algorithms.
 
 config CRYPTO_DEV_ZYNQMP_SHA3
-	bool "Support for Xilinx ZynqMP SHA3 hardware accelerator"
-	depends on ZYNQMP_FIRMWARE
+	tristate "Support for Xilinx ZynqMP SHA3 hardware accelerator"
+	depends on ZYNQMP_FIRMWARE || COMPILE_TEST
 	select CRYPTO_SHA3
 	help
 	  Xilinx ZynqMP has SHA3 engine used for secure hash calculation.