Convert CONFIG_BOOTCOUNT_I2C to Kconfig

This converts the following to Kconfig:
  CONFIG_BOOTCOUNT_I2C
Signed-off-by: NAlex Kiernan <alex.kiernan@gmail.com>
Reviewed-by: NLukasz Majewski <lukma@denx.de>

README

@@ -2270,12 +2270,6 @@ The following options need to be configured:
 - bootcount support:
 		CONFIG_AT91SAM9XE
 		enable special bootcounter support on at91sam9xe based boards.
-		CONFIG_BOOTCOUNT_I2C
-		enable support for the bootcounter on an i2c (like RTC) device.
-			CONFIG_SYS_I2C_RTC_ADDR = i2c chip address
-			CONFIG_SYS_BOOTCOUNT_ADDR = i2c addr which is used for
-						    the bootcounter.
-			CONFIG_BOOTCOUNT_ALEN = address len
 		CONFIG_BOOTCOUNT_EXT
 		enable support for the bootcounter in EXT filesystem
 			CONFIG_SYS_BOOTCOUNT_ADDR = RAM address used for read

configs/ids8313_defconfig

@@ -35,6 +35,7 @@ CONFIG_BOOTP_GATEWAY=y
 CONFIG_BOOTP_HOSTNAME=y
 CONFIG_BOOTP_SUBNETMASK=y
 CONFIG_BOOTCOUNT_LIMIT=y
+CONFIG_BOOTCOUNT_I2C=y
 # CONFIG_MMC is not set
 CONFIG_MTD_NOR_FLASH=y
 CONFIG_PHYLIB=y

drivers/bootcount/Kconfig

@@ -46,6 +46,15 @@ config BOOTCOUNT_RAM
 	  Store the bootcount in DRAM protected against against bit errors
 	  due to short power loss or holding a system in RESET.
 
+config BOOTCOUNT_I2C
+	bool "Boot counter on I2C device"
+	help
+	  Enable support for the bootcounter on an i2c (like RTC) device.
+	  CONFIG_SYS_I2C_RTC_ADDR = i2c chip address
+	  CONFIG_SYS_BOOTCOUNT_ADDR = i2c addr which is used for
+	                              the bootcounter.
+	  CONFIG_BOOTCOUNT_ALEN = address len
+
 endchoice
 
 config SYS_BOOTCOUNT_SINGLEWORD

include/configs/ids8313.h

@@ -509,7 +509,6 @@
 #define CONFIG_MTD_PARTITIONS
 
 /* bootcount support */
-#define CONFIG_BOOTCOUNT_I2C
 #define CONFIG_BOOTCOUNT_ALEN	1
 #define CONFIG_SYS_BOOTCOUNT_ADDR	0x9
 

scripts/config_whitelist.txt

@@ -146,7 +146,6 @@ CONFIG_BOARD_TYPES
 CONFIG_BOOGER
 CONFIG_BOOTBLOCK
 CONFIG_BOOTCOUNT_ALEN
-CONFIG_BOOTCOUNT_I2C
 CONFIG_BOOTFILE
 CONFIG_BOOTMAPSZ
 CONFIG_BOOTMODE