Convert CONFIG_SYS_CBSIZE to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_CBSIZE

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/netgear_cg3100d_ram_defconfig b/configs/netgear_cg3100d_ram_defconfig
index d82df1e..05ab61b 100644
--- a/configs/netgear_cg3100d_ram_defconfig
+++ b/configs/netgear_cg3100d_ram_defconfig
@@ -18,6 +18,7 @@
 CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="CG3100D # "
 CONFIG_SYS_MAXARGS=24
+CONFIG_SYS_CBSIZE=512
 CONFIG_SYS_PBSIZE=539
 CONFIG_CMD_CPU=y
 CONFIG_CMD_LICENSE=y