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/pm9261_defconfig b/configs/pm9261_defconfig
index 585bf7e..c423c14 100644
--- a/configs/pm9261_defconfig
+++ b/configs/pm9261_defconfig
@@ -22,6 +22,7 @@
 CONFIG_BOARD_EARLY_INIT_F=y
 # CONFIG_AUTO_COMPLETE is not set
 CONFIG_SYS_PROMPT="pm9261> "
+CONFIG_SYS_CBSIZE=256
 CONFIG_SYS_PBSIZE=281
 # CONFIG_CMD_BDI is not set
 # CONFIG_CMD_IMI is not set