fix(zynqmp): move debug bl31 based address back to OCM

The commit 389594dfa7 ("fix(zynqmp): move bl31 with DEBUG=1 back to OCM")
tried to move address to OCM but address was actually out of OCM and likely
it was typo. Correct default address should be 0xfffe5000. If TF-A size is
bigger please select location DDR which should be fine for DEBUG cases.

Reported-by: Vesa Jääskeläinen <vesa.jaaskelainen@vaisala.com>
Signed-off-by: Michal Simek <michal.simek@amd.com>
Change-Id: I055f3a59cdca527f6029fcc2a19d76be35924d24

plat/xilinx/zynqmp/include/platform_def.h

@@ -40,7 +40,7 @@
 # define BL31_BASE			U(0xfffea000)
 # define BL31_LIMIT			U(0x100000000)
 #else
-# define BL31_BASE			U(0xfff5a000)
+# define BL31_BASE			U(0xfffe5000)
 # define BL31_LIMIT			U(0x100000000)
 #endif
 #else