Convert CONFIG_SYS_BOOTCOUNT_SINGLEWORD to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_BOOTCOUNT_SINGLEWORD

Signed-off-by: Lukasz Majewski <lukma@denx.de>
Tested-by: Alex Kiernan <alex.kiernan@gmail.com>
Reviewed-by: Ian Ray <ian.ray@ge.com>

configs/highbank_defconfig

@@ -26,6 +26,7 @@ CONFIG_EFI_PARTITION=y
 CONFIG_ENV_IS_IN_NVRAM=y
 CONFIG_SCSI_AHCI=y
 CONFIG_BOOTCOUNT_LIMIT=y
+CONFIG_SYS_BOOTCOUNT_SINGLEWORD=y
 # CONFIG_MMC is not set
 CONFIG_SCSI=y
 CONFIG_OF_LIBFDT=y

drivers/bootcount/Kconfig

@@ -17,6 +17,12 @@ config BOOTCOUNT_LIMIT
 	  Enable checking for exceeding the boot count limit.
 	  More information: http://www.denx.de/wiki/DULG/UBootBootCountLimit
 
+config SYS_BOOTCOUNT_SINGLEWORD
+	bool "Use single word to pack boot count and magic value"
+	help
+	  This option enables packing boot count magic value and boot count
+	  into single word (32 bits).
+
 if BOOTCOUNT
 
 config BOOTCOUNT_EXT

include/configs/highbank.h

@@ -26,7 +26,6 @@
 #define CONFIG_PL01x_PORTS		{ (void *)(0xFFF36000) }
 #define CONFIG_CONS_INDEX		0
 
-#define CONFIG_SYS_BOOTCOUNT_SINGLEWORD
 #define CONFIG_SYS_BOOTCOUNT_LE		/* Use little-endian accessors */
 #define CONFIG_SYS_BOOTCOUNT_ADDR	0xfff3cf0c