[U-Boot] [00/13] Move conditional compilation to Makefile

Hi,

This the first series of patch to Move conditional compilation to Makefile.

It will introduce the following major change of MACRO

rename CFG_FLASH_CFI_DRIVER to CONFIG_FLASH_CFI_DRIVER rename CFG_NAND_LEGACY to CONFIG_NAND_LEGACY rename CFG_NS9750_UART to CONFIG_NS9750_UART rename move CFG_SCIF_CONSOLE to CONFIG_SCIF_CONSOLE

Best Regards, J.