Convert CONFIG_CMD_BAT to Kconfig

This converts the following to Kconfig:
   CONFIG_CMD_BAT

Signed-off-by: Simon Glass <sjg@chromium.org>

board/ti/sdp4430/Kconfig

@@ -9,4 +9,7 @@ config SYS_VENDOR
 config SYS_CONFIG_NAME
 	default "omap4_sdp4430"
 
+config CMD_BAT
+	bool "Enable board-specific battery command"
+
 endif

configs/omap4_sdp4430_defconfig

@@ -4,6 +4,7 @@ CONFIG_ARM=y
 CONFIG_ARCH_OMAP2PLUS=y
 CONFIG_OMAP44XX=y
 CONFIG_TARGET_OMAP4_SDP4430=y
+CONFIG_CMD_BAT=y
 # CONFIG_SPL_NAND_SUPPORT is not set
 CONFIG_DISTRO_DEFAULTS=y
 CONFIG_SYS_CONSOLE_IS_IN_ENV=y

include/configs/omap4_sdp4430.h

@@ -21,11 +21,6 @@
 
 #include <configs/ti_omap4_common.h>
 
-/* Battery Charger */
-#ifndef CONFIG_SPL_BUILD
-#define CONFIG_CMD_BAT			1
-#endif
-
 /* ENV related config options */
 #define CONFIG_ENV_IS_IN_MMC		1
 #define CONFIG_SYS_MMC_ENV_DEV		1	/* SLOT2: eMMC(1) */

scripts/config_whitelist.txt

@@ -393,7 +393,6 @@ CONFIG_CM922T_XA10
 CONFIG_CMDLINE_EDITING
 CONFIG_CMDLINE_PS_SUPPORT
 CONFIG_CMDLINE_TAG
-CONFIG_CMD_BAT
 CONFIG_CMD_BEDBUG
 CONFIG_CMD_BLOB
 CONFIG_CMD_BMODE