arm: mvebu: clearfog: move ENV params to Kconfig

Migrate the values for ENV_SIZE and ENV_OFFSET into board specific
Kconfig defaults so they're more accessible for configuration.

Signed-off-by: Joel Johnson <mrjoel@lixil.net>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/board/solidrun/clearfog/Kconfig b/board/solidrun/clearfog/Kconfig
index ea9c419..e8c3f53 100644
--- a/board/solidrun/clearfog/Kconfig
+++ b/board/solidrun/clearfog/Kconfig
@@ -39,6 +39,14 @@
 	  SGMII connection (requires a supporting SFP). By default, transfer speed
 	  of 1.25 Gbps is used, suitable for a more common 1 Gbps SFP module.
 
+config ENV_SIZE
+	hex "Environment Size"
+	default 0x10000
+
+config ENV_OFFSET
+	hex "Environment offset"
+	default 0xF0000
+
 config ENV_SECT_SIZE
 	hex "Environment Sector-Size"
 	# Use SPI flash erase block size of 4 KiB