zynqmp: Put pm_secure_lock in coherent memory region

DEFINE_BAKERY_LOCK() macro is used to put lock in coherent memory region.
ARM Trusted Firmware design guide, chapter 11 states that bakery_lock data
structures should be allocated in coherent memory region because it is
accessed by multiple CPUs with mismatched shareability, cacheability and
memory attributes.
Signed-off-by: Stefan Krsmanovic <stefan.krsmanovic@aggios.com>
Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>

plat/xilinx/zynqmp/pm_service/pm_ipi.c

@@ -81,7 +81,7 @@
 
 #define IPI_APU_MASK		1U
 
-static bakery_lock_t pm_secure_lock;
+DEFINE_BAKERY_LOCK(pm_secure_lock);
 
 const struct pm_ipi apu_ipi = {
 	.mask = IPI_APU_MASK,