spi: microchip: Enable compile-testing for FPGA SPI controllers

The Microchip FPGA SPI controller driver builds fine on other platforms.

While at it, drop a superfluous empty line.

Signed-off-by: Geert Uytterhoeven <[e-mail]>
Link: https://patch.msgid.link/6f968[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

drivers/spi/Kconfig

···
 	  bus and a PL022 controller, say Y or M here.
 
 config SPI_POLARFIRE_SOC
-
 	tristate "Microchip FPGA SPI controllers"
-	depends on SPI_MASTER && ARCH_MICROCHIP
+	depends on SPI_MASTER
+	depends on ARCH_MICROCHIP || COMPILE_TEST
 	help
 	  This enables the SPI driver for Microchip FPGA SPI controllers.
 	  Say Y or M here if you want to use the "hard" controllers on