Compiling for arm requires using the arm kernel headers and not
the aarch64 kernel headers. Add $(combo_2nd_arch_prefix) to get
asm-$(TARGET_2ND_ARCH) when arm is the 2nd arch.
Change-Id: I15270d0ef35e48c034bf4d0d5e35b76f67b2a8e1
KERNEL_HEADERS_COMMON := $(libc_root)/kernel/uapi
-KERNEL_HEADERS_ARCH := $(libc_root)/kernel/uapi/asm-$(TARGET_ARCH)
+KERNEL_HEADERS_ARCH := $(libc_root)/kernel/uapi/asm-$(TARGET_$(combo_2nd_arch_prefix)ARCH)
KERNEL_HEADERS := $(KERNEL_HEADERS_COMMON) $(KERNEL_HEADERS_ARCH)
$(combo_2nd_arch_prefix)TARGET_C_INCLUDES := \