BINDER_VM_SIZE: 1MB? this isn't 1997. 2MB for non-LOWMEM arches

Double bass pedals > normal base pedals.
Double binder size > normal binder size?

This tweaks a constant that hasn't change sinced c0c1092183ceb38dd4d70d2732dd3a743fefd567

LOWMEM_ARCH conditionalization brought to you by @Nuclearmistake

Change-Id: I1c75b3fe4ecaced9c6622cc069e8a0cf9b634a23
Allow non-"low-mem" devices with memory issues to use a smaller binder vm size

Change-Id: I6110067a314f0ca6b18637e427fb80173de77f2b