Convert CONFIG_SYS_PBSIZE to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_PBSIZE

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/libretech_all_h5_cc_h5_defconfig b/configs/libretech_all_h5_cc_h5_defconfig
index c3aa4b1..987393d 100644
--- a/configs/libretech_all_h5_cc_h5_defconfig
+++ b/configs/libretech_all_h5_cc_h5_defconfig
@@ -7,6 +7,7 @@
 CONFIG_MMC_SUNXI_SLOT_EXTRA=2
 CONFIG_SPL_SPI_SUNXI=y
 # CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
+CONFIG_SYS_PBSIZE=1024
 CONFIG_SPI_FLASH_XMC=y
 CONFIG_SUN8I_EMAC=y
 CONFIG_SPI=y