plat/arm: Compile out impossible conditional for AArch32

Since ARM_DRAM2_BASE is above the 32-bit limit, the condition
is always false.  Wrap this condition in an ifndef to avoid
warnings during compilation.

Change-Id: Ideabb6c65de6c62474ed03eb29df4b049d5316be
Signed-off-by: dp-arm <dimitris.papastamos@arm.com>

plat/arm/common/arm_pm.c

@@ -122,9 +122,11 @@ int arm_validate_ns_entrypoint(uintptr_t entrypoint)
 	if ((entrypoint >= ARM_NS_DRAM1_BASE) && (entrypoint <
 			(ARM_NS_DRAM1_BASE + ARM_NS_DRAM1_SIZE)))
 		return PSCI_E_SUCCESS;
+#ifndef AARCH32
 	if ((entrypoint >= ARM_DRAM2_BASE) && (entrypoint <
 			(ARM_DRAM2_BASE + ARM_DRAM2_SIZE)))
 		return PSCI_E_SUCCESS;
+#endif
 
 	return PSCI_E_INVALID_ADDRESS;
 }