sandbox: Finish migration to Kconfig

Stop using CONFIG_SANDBOX_ARCH and use CONFIG_SANDBOX instead. For the
SPI related defines, set them directly in Kconfig. This now empties
arch/sandbox/include/asm/config.h.

Cc: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index c6900f4..64ceed1 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -429,6 +429,16 @@
 		};
 	  };
 
+config SANDBOX_SPI_MAX_BUS
+	int
+	depends on SANDBOX
+	default 1
+
+config SANDBOX_SPI_MAX_CS
+	int
+	depends on SANDBOX
+	default 10
+
 config SPI_ASPEED_SMC
 	bool "ASPEED SPI flash controller driver"
 	depends on DM_SPI && SPI_MEM