bcm2835_mu_serial: Convert to Kconfig

Setting config options using headers is deprecated. This patch converts
the BCM2835 Mini-UART to Kconfig.

Signed-off-by: Alexander Graf <agraf@suse.de>
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index 4167683..72281a7 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -388,6 +388,13 @@
 	  configured in the device tree, and input clock frequency can
 	  be got from the clk node.
 
+config BCM283X_MU_SERIAL
+	bool "Support for BCM283x Mini-UART"
+	depends on DM_SERIAL && ARCH_BCM283X
+	default y
+	help
+	  Select this to enable Mini-UART support on BCM283X family of SoCs.
+
 config BCM6345_SERIAL
 	bool "Support for BCM6345 UART"
 	depends on DM_SERIAL && ARCH_BMIPS
diff --git a/include/configs/rpi.h b/include/configs/rpi.h
index 5ffe980..f2d3646 100644
--- a/include/configs/rpi.h
+++ b/include/configs/rpi.h
@@ -75,9 +75,6 @@
 #define CONFIG_MISC_INIT_R
 #endif
 
-/* Console UART, can be configured dynamically in config.txt */
-#define CONFIG_BCM283X_MU_SERIAL
-
 /* Console configuration */
 #define CONFIG_SYS_CBSIZE		1024
 
diff --git a/scripts/config_whitelist.txt b/scripts/config_whitelist.txt
index e7e5cb2..efcb251 100644
--- a/scripts/config_whitelist.txt
+++ b/scripts/config_whitelist.txt
@@ -121,7 +121,6 @@
 CONFIG_BCH_CONST_PARAMS
 CONFIG_BCH_CONST_T
 CONFIG_BCM2835_GPIO
-CONFIG_BCM283X_MU_SERIAL
 CONFIG_BIOSEMU
 CONFIG_BITBANGMII_MULTI
 CONFIG_BL1_OFFSET