pinctrl: Rework Kconfig dependency for BM1880 pinctrl driver

Make the BM1880 SoC pinctrl driver depend on COMPILE_TEST to get compiler
test coverage and also select this driver by default for ARCH_BITMAIN
platform.
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/Kconfig

@@ -110,7 +110,8 @@ config PINCTRL_AMD
 
 config PINCTRL_BM1880
 	bool "Bitmain BM1880 Pinctrl driver"
-	depends on ARCH_BITMAIN
+	depends on OF && (ARCH_BITMAIN || COMPILE_TEST)
+	default ARCH_BITMAIN
 	select PINMUX
 	help
 	  Pinctrl driver for Bitmain BM1880 SoC.