dev-arm: Adjust off_chip ranges in VExpress_GEM5 platform

This is need after commit b4c9996d89
which makes the AddrRange end address non inclusive.

Change-Id: I859b84f6a91107815236b67c4596291c78881fe3
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/23003
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/dev/arm/RealView.py

@@ -877,9 +877,9 @@ Interrupts:
 
     _off_chip_ranges = [
         # CS1-CS5
-        AddrRange(0x0c000000, 0x1fffffff),
+        AddrRange(0x0c000000, 0x20000000),
         # External AXI interface (PCI)
-        AddrRange(0x2f000000, 0x7fffffff),
+        AddrRange(0x2f000000, 0x80000000),
     ]
 
     bootmem = SimpleMemory(range=AddrRange(0, size='64MB'),