Convert CONFIG_SYS_BOOTPARAMS_LEN to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_BOOTPARAMS_LEN

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/hihope_rzg2_defconfig b/configs/hihope_rzg2_defconfig
index 4470cc7..8bf14e0 100644
--- a/configs/hihope_rzg2_defconfig
+++ b/configs/hihope_rzg2_defconfig
@@ -20,6 +20,7 @@
 CONFIG_BOOTCOMMAND="tftp 0x48080000 Image; tftp 0x48000000 Image-r8a774a1-hihope-rzg2m.dtb; booti 0x48080000 - 0x48000000"
 CONFIG_DEFAULT_FDT_FILE="r8a774a1-hihope-rzg2m.dtb"
 # CONFIG_BOARD_EARLY_INIT_F is not set
+CONFIG_SYS_MALLOC_BOOTPARAMS=y
 CONFIG_HUSH_PARSER=y
 CONFIG_SYS_MAXARGS=64
 CONFIG_SYS_PBSIZE=2068