cfi_flash: give default CONFIG_SYS_MAX_FLASH_SECT in flash.h

Give default CONFIG_SYS_MAX_FLASH_SECT in flash.h, so that
the header can be included regardless of the present of flash.
The value 512 is the most used.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Signed-off-by: Stefan Roese <sr@denx.de>
1 file changed