[DO NOT MERGE] Fix -Os thumb2 causing video recording FCs on FLO and HH

-Os is essentially -O2 with some cflags disabled.  this reenables the problematic
flag disabled with -Os.  At some point this needs to be moved to the regression
locally

Change-Id: I8284220c52cad3037ea3398c0429901e6bc075e1

Conflicts:
	core/combo/TARGET_linux-arm.mk