TI DaVinci Sonata: Add Config option for 64 bit Support

Adding the CONFIG_SYS_64BIT_VSPRINTF fot the DM644x based Sonata
Without this option enabled while performing NAND operations we will get
wrong diagnostic messages.
Example if the MTD NAND driver find a bad block while erasing from
a certain address, it will say bad block skipped at 0x00000000.

Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>