ARM: zynq: Remove CONFIG_API

CONFIG_API is causing compilation error when DM_ETH is enabled because
eth_get_dev() is not available.
Signed-off-by: NMichal Simek <michal.simek@xilinx.com>
Reviewed-by: NJagan Teki <jteki@openedev.com>

include/configs/zynq-common.h

@@ -297,7 +297,6 @@
 
 /* Boot FreeBSD/vxWorks from an ELF image */
 #if defined(CONFIG_ZYNQ_BOOT_FREEBSD)
-# define CONFIG_API
 # define CONFIG_SYS_MMC_MAX_DEVICE	1
 #endif