plat: xilinx: Use fno-jump-tables flag in CPPFLAGS

From GCC-9 implementation of switch case was generated through jump tables,
because of which we are seeing 1MB increase in rodata section. To reduce
the size we are recommending to use fno-jump-tables.
Signed-off-by: Venkatesh Yadav Abbarapu <venkatesh.abbarapu@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Change-Id: I069733610809b8299fbf641f0ae35b359a8afd69

plat/xilinx/zynqmp/platform.mk

@@ -95,6 +95,8 @@ BL31_SOURCES		+=	drivers/arm/cci/cci.c				\
 				plat/xilinx/zynqmp/pm_service/pm_api_clock.c	\
 				plat/xilinx/zynqmp/pm_service/pm_client.c
 
+BL31_CPPFLAGS		+=	-fno-jump-tables
+
 ifneq (${RESET_TO_BL31},1)
   $(error "Using BL31 as the reset vector is only one option supported on ZynqMP. Please set RESET_TO_BL31 to 1.")
 endif