Revert "Makefile: Fix LLVM_IAS condition after IAS default flip"

This reverts commit 134fdb5c71.

Reason for revert: Replaced by upstream commit.

Change-Id: I1482b87ca2fe94a377454728c004f3038df02137

Makefile

@@ -829,10 +829,10 @@ KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 else
 KBUILD_CFLAGS	+= -g
 endif
-ifeq ($(LLVM_IAS),0)
-KBUILD_AFLAGS	+= -Wa,-gdwarf-2
-else
+ifeq ($(LLVM_IAS),1)
 KBUILD_AFLAGS	+= -g
+else
+KBUILD_AFLAGS	+= -Wa,-gdwarf-2
 endif
 endif