zynqmp: FSBL->ATF handover

Parse the parameter structure the FSBL populates, to populate the bl32
and bl33 image structures.

Cc: Sarat Chand Savitala <saratcha@xilinx.com>
Cc: petalinux-dev@xilinx.com
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
[ SB
 - pass pointers to structs instead of structs
 - handle execution state parameter
 - populate bl32 SPSR
 - add documentation
 - query bootmode and consider missing handoff parameters an error when
   not in JTAG boot mode
]
Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
diff --git a/plat/xilinx/zynqmp/zynqmp_def.h b/plat/xilinx/zynqmp/zynqmp_def.h
index 9496ec4..13498b5 100644
--- a/plat/xilinx/zynqmp/zynqmp_def.h
+++ b/plat/xilinx/zynqmp/zynqmp_def.h
@@ -98,6 +98,7 @@
 /* PMU registers and bitfields */
 #define PMU_GLOBAL_BASE			0xFFD80000
 #define PMU_GLOBAL_CNTRL		(PMU_GLOBAL_BASE + 0)
+#define PMU_GLOBAL_GEN_STORAGE6		(PMU_GLOBAL_BASE + 0x48)
 #define PMU_GLOBAL_REQ_PWRUP_STATUS	(PMU_GLOBAL_BASE + 0x110)
 #define PMU_GLOBAL_REQ_PWRUP_EN		(PMU_GLOBAL_BASE + 0x118)
 #define PMU_GLOBAL_REQ_PWRUP_DIS	(PMU_GLOBAL_BASE + 0x11c)