Fix recovery image build for 32p

When building for 32p, we need to be explicit that we wish to build the 32bit
version of the binaries that will be placed in the recovery image. The recovery
image doesn't actually care... but if we are not explicit in this, the makefiles
will ask for the 64bit binaries but the Android.mk for the binaries will supply
the 32bit images (causing the build to fail)..

Change-Id: I728912bc8e07726888fe8bed4352cbb373911cb7
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>