examples: freertos: zynqmp_amp_demo: wrap demo symbols in #ifndef's

Allow Shared memory, TTC and IPI values to be set dynamically. This will enable
the demos to be run on different platforms.

Signed-off-by: Ben Levinsky <ben.levinsky@amd.com>

examples/system/freertos/zynqmp_r5/zynqmp_amp_demo/common.h

@@ -36,8 +36,12 @@
 #define IPI_IER_OFFSET  0x18 /* IPI interrupt enable reg offset */
 #define IPI_IDR_OFFSET  0x1C /* IPI interrupt disable reg offset */
 
-#define IPI_MASK        0x1000000 /* IPI mask for kick from APU.
-				     We use PL0 IPI in this demo. */
+#ifndef IPI_MASK
+/*
+ * IPI mask for kick from APU. We use PL0 IPI in this demo.
+ */
+#define IPI_MASK        0x1000000
+#endif
 
 /* TTC counter offsets */
 #define XTTCPS_CLK_CNTRL_OFFSET 0x0  /* TTC counter clock control reg offset */

examples/system/freertos/zynqmp_r5/zynqmp_amp_demo/sys_init.c

@@ -29,11 +29,21 @@
 
 #define INTC_DEVICE_ID		XPAR_SCUGIC_0_DEVICE_ID
 
+#ifndef IPI_IRQ_VECT_ID
 #define IPI_IRQ_VECT_ID         65
+#endif
 
+#ifndef SHM_BASE_ADDR
 #define SHM_BASE_ADDR   0x3ED80000
+#endif
+
+#ifndef TTC0_BASE_ADDR
 #define TTC0_BASE_ADDR  0xFF110000
+#endif
+
+#ifndef IPI_BASE_ADDR
 #define IPI_BASE_ADDR   0xFF310000
+#endif
 
 /* Default generic I/O region page shift */
 /* Each I/O region can contain multiple pages.