ARM: fix LTO build for some thumb-interwork cases

Fix LTO build for some thumb-interwork usecases (such as for
da850evm_defconfig), where inline assmebly such as
  mrc p15,0,r2,c1,c0,0
causes the compiler to fail during LTO linking with
  Error: selected processor does not support `mrc p15,0,r2,c1,c0,0'
         in Thumb mode

Signed-off-by: Marek BehĂșn <marek.behun@nic.cz>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/cpu/arm926ejs/Makefile b/arch/arm/cpu/arm926ejs/Makefile
index af63d5c..98aafe8 100644
--- a/arch/arm/cpu/arm926ejs/Makefile
+++ b/arch/arm/cpu/arm926ejs/Makefile
@@ -25,6 +25,8 @@
 
 CFLAGS_cpu.o := -marm
 CFLAGS_cache.o := -marm
+CFLAGS_REMOVE_cpu.o := $(LTO_CFLAGS)
+CFLAGS_REMOVE_cache.o := $(LTO_CFLAGS)
 
 endif
 endif