MPC8610HPCD: Drop -O2 from the build flags

Make the flags use -Os like all other boards
Signed-off-by: NKumar Gala <galak@kernel.crashing.org>

board/freescale/mpc8610hpcd/config.mk

@@ -22,4 +22,4 @@
 TEXT_BASE = 0xfff00000
 
 PLATFORM_CPPFLAGS += -DCONFIG_MPC86xx=1
-PLATFORM_CPPFLAGS += -DCONFIG_MPC8610=1 -maltivec -mabi=altivec -msoft-float -O2
+PLATFORM_CPPFLAGS += -DCONFIG_MPC8610=1 -maltivec -mabi=altivec -msoft-float