feat(rdn2): add SPI ID ranges for RD-N2 multichip platform

Add the SPI ID ranges for various chips on RD-N2 multichip platform
(rdn2cfg2). Also fix the max SPI ID for chip#0 that was incorrectly
set.
The SPI ranges for rdn2cfg2 platform are as shown below:
============================================
Chip# |  CHIP_START_INTID  |  CHIP_END_INTID
============================================
0     |     32             |    511
1     |     512            |    991
2     |     4096           |    4575
3     |     4576           |    5055

Signed-off-by: Vivek Gautam <vivek.gautam@arm.com>
Change-Id: I146944af1ffe52c300eef2ef48b1077a9559bf41
diff --git a/plat/arm/board/rdn2/rdn2_plat.c b/plat/arm/board/rdn2/rdn2_plat.c
index 8cf1929..2506f9d 100644
--- a/plat/arm/board/rdn2/rdn2_plat.c
+++ b/plat/arm/board/rdn2/rdn2_plat.c
@@ -47,15 +47,15 @@
 #endif
 	},
 	.spi_ids = {
-		{32, 479},
+		{32, 511},
 	#if CSS_SGI_CHIP_COUNT > 1
-		{0, 0},
+		{512, 991},
 	#endif
 	#if CSS_SGI_CHIP_COUNT > 2
-		{0, 0},
+		{4096, 4575},
 	#endif
 	#if CSS_SGI_CHIP_COUNT > 3
-		{0, 0},
+		{4576, 5055},
 	#endif
 	}
 };