Enable TARGET_ARCH_LOWMEM for low memory targets

Change-Id: I07e5745ccb2acc9f02d4f06e25e1abc7115a7a26
Revert "Enable ARM_PIE to fix boot"

This reverts commit 8174b6221ba3e6b99b9b170e34491849459a9131.

Conflicts:
	BoardConfigCommon.mk