ARM64: zynqmp: Cleanup config file after CMD move

The patch:
"configs: Re-sync almost all of cmd/Kconfig"
(sha1: 78d1e1d0)
doesn't remove empty if-endif. This patch is fixing it.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>

include/configs/xilinx_zynqmp.h

@@ -75,10 +75,6 @@
 #define CONFIG_BOOTP_MAY_FAIL
 #define CONFIG_BOOTP_SERVERIP
 
-/* SPI */
-#ifdef CONFIG_ZYNQ_SPI
-#endif
-
 #if defined(CONFIG_ZYNQ_SDHCI)
 # define CONFIG_MMC
 # define CONFIG_GENERIC_MMC