ARM: zynq: Remove single comment about QSPI

Very likely configs have been moved to Kconfig by scripts and this just
remains there that's why remove it.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/include/configs/zynq-common.h b/include/configs/zynq-common.h
index 2d53237..b1cef4d 100644
--- a/include/configs/zynq-common.h
+++ b/include/configs/zynq-common.h
@@ -41,8 +41,6 @@
 # define CONFIG_BOOTP_MAY_FAIL
 #endif
 
-/* QSPI */
-
 /* NOR */
 #ifdef CONFIG_MTD_NOR_FLASH
 # define CONFIG_SYS_FLASH_BASE		0xE2000000