encore defconfigs: move to common kernel config for CM10.1 and 10.2

The CM10.2 config has always been fully functional on CM10.1, but
enabling CONFIG_AUDIT changes the kernel ABI, and we wanted to avoid an
ABI break during the CM10.1 stable releases.  Now that the (in all
probability) last 10.1 release has been made, and we've broken the ABI
anyway by merging a bunch of 3.0-stable releases, just use the CM10.2
config on CM10.1+.

Change-Id: Ice1170a3f58def9bd8074ad956371e4a86a42b7e
encore defconfigs: disable CONFIG_CC_OPTIMIZE_FOR_SIZE

With GCC releases before 4.8, using -Os causes the compiler to ignore
Linux's likely()/unlikely() branch profiling hints, which more than
wipes out any gains we get from reduced icache footprint.  See
http://lwn.net/Articles/534735/ and
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54364 .

Change-Id: I3693f33557bb3b9731eff9379a2ab78ea309b078