Kconfig: Move CONFIG_BOOTCOUNT_ALTBOOTCMD to Kconfig

Add CONFIG_BOOTCOUNT_ALTBOOTCMD so the developer is able to add
custom altbootcmd via Kconfig when they enable BOOTCOUNT. With this now
in Kconfig, we need to move it from environment files / config.h files
and in to the defconfig file.

This was done by generating u-boot-initial-env for all platforms before
the Kconfig change, to extract altbootcmd values and then again after to
compare the result.

[trini: Perform migration to defconfigs, reword commit message]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/bootcount/Kconfig b/drivers/bootcount/Kconfig
index 0080d2a..99b6c75 100644
--- a/drivers/bootcount/Kconfig
+++ b/drivers/bootcount/Kconfig
@@ -183,6 +183,9 @@
 	  counter being cleared.
 	  If set to 0, do not set a boot limit in the environment.
 
+config BOOTCOUNT_ALTBOOTCMD
+	string "Alternative boot command when BOOTLIMIT is reached"
+
 config SYS_BOOTCOUNT_SINGLEWORD
 	bool "Use single word to pack boot count and magic value"
 	depends on BOOTCOUNT_GENERIC