Revert "Enable uapi kernel headers for arm."

This reverts commit 88c6c533e17f7bc2e1491310b8d679a91b33aaeb.

Change-Id: I3cd84383c6f217bc6e627e16b2d0c7d948f8131d
diff --git a/core/combo/TARGET_linux-arm.mk b/core/combo/TARGET_linux-arm.mk
index a946b23..64957bf 100644
--- a/core/combo/TARGET_linux-arm.mk
+++ b/core/combo/TARGET_linux-arm.mk
@@ -203,10 +203,11 @@
     KERNEL_HEADERS_COMMON := $(CUSTOM_KERNEL_HEADERS)
     KERNEL_HEADERS_ARCH   := $(CUSTOM_KERNEL_HEADERS)
 else
-    KERNEL_HEADERS_COMMON := $(libc_root)/kernel/uapi
-    KERNEL_HEADERS_ARCH   := $(libc_root)/kernel/uapi/asm-$(TARGET_ARCH)
+    KERNEL_HEADERS_COMMON := $(libc_root)/kernel/common
+    KERNEL_HEADERS_ARCH   := $(libc_root)/kernel/arch-$(TARGET_ARCH)
+    KERNEL_HEADERS_AUX    := $(libc_root)/kernel/uapi # for kexec.h
 endif
-KERNEL_HEADERS := $(KERNEL_HEADERS_COMMON) $(KERNEL_HEADERS_ARCH)
+KERNEL_HEADERS := $(KERNEL_HEADERS_COMMON) $(KERNEL_HEADERS_ARCH) $(KERNEL_HEADERS_AUX)
 
 TARGET_C_INCLUDES := \
 	$(libc_root)/arch-arm/include \