bootcount: spl: Enable bootcount support in SPL

New, SPL related config option - CONFIG_SPL_BOOTCOUNT_LIMIT has been
added to allow drivers/bootcount code re-usage in SPL.

This code is necessary to use and setup bootcount in SPL in the case of
falcon boot mode.

Signed-off-by: Lukasz Majewski <lukma@denx.de>
Reviewed-by: Stefan Roese <sr@denx.de>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Alex Kiernan <alex.kiernan@gmail.com>
diff --git a/drivers/Makefile b/drivers/Makefile
index edbcadf..b3f1b60 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -18,6 +18,7 @@
 ifndef CONFIG_TPL_BUILD
 ifdef CONFIG_SPL_BUILD
 
+obj-$(CONFIG_SPL_BOOTCOUNT_LIMIT) += bootcount/
 obj-$(CONFIG_SPL_CPU_SUPPORT) += cpu/
 obj-$(CONFIG_SPL_CRYPTO_SUPPORT) += crypto/
 obj-$(CONFIG_SPL_GPIO_SUPPORT) += gpio/