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/netgear_cg3100d_ram_defconfig b/configs/netgear_cg3100d_ram_defconfig
index 05ab61b..4336116 100644
--- a/configs/netgear_cg3100d_ram_defconfig
+++ b/configs/netgear_cg3100d_ram_defconfig
@@ -15,6 +15,7 @@
 # CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
 CONFIG_OF_STDOUT_VIA_ALIAS=y
 CONFIG_DISPLAY_CPUINFO=y
+CONFIG_SYS_MALLOC_BOOTPARAMS=y
 CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="CG3100D # "
 CONFIG_SYS_MAXARGS=24