cmake: emu: armfvp: Only add the -a argument if not already present

Some target may need to pass in the application argument. In such case
do not override it.

Signed-off-by: Wilfried Chauveau <wilfried.chauveau@arm.com>
Signed-off-by: Sudan Landge <sudan.landge@arm.com>

cmake/emu/armfvp.cmake

@@ -53,10 +53,13 @@ elseif(CONFIG_ARMV8_A_NS)
     --data cluster0.cpu0="${APPLICATION_BINARY_DIR}/zephyr/${KERNEL_BIN_NAME}"@0x88000000
     )
 else()
+  string(FIND "${ARMFVP_FLAGS}" " -a " ARMFVP_APPARG_POS)
+  if(${ARMFVP_APPARG_POS} EQUAL -1)
     set(ARMFVP_FLAGS ${ARMFVP_FLAGS}
       -a ${APPLICATION_BINARY_DIR}/zephyr/${KERNEL_ELF_NAME}
     )
   endif()
+endif()
 
 if(CONFIG_ETH_SMSC91X)
   set(ARMFVP_FLAGS ${ARMFVP_FLAGS}