Split WITHOUT_CLANG to WITHOUT_HOST_CLANG and WITHOUT_TARGET_CLANG

Still keep WITHOUT_CLANG, which enables both.

Bug: 13402154
Change-Id: I32cb668223997719875751bf3d64f592d6086830
diff --git a/core/combo/TARGET_linux-arm64.mk b/core/combo/TARGET_linux-arm64.mk
index 7a7a0c9..290cebe 100644
--- a/core/combo/TARGET_linux-arm64.mk
+++ b/core/combo/TARGET_linux-arm64.mk
@@ -48,7 +48,7 @@
 endif
 
 # TODO: Enable Clang when aarch64 prebuilt is added
-WITHOUT_CLANG := true
+WITHOUT_TARGET_CLANG := true
 
 include $(TARGET_ARCH_SPECIFIC_MAKEFILE)
 
diff --git a/core/combo/TARGET_linux-mips64.mk b/core/combo/TARGET_linux-mips64.mk
index c1c6439..099edfa 100644
--- a/core/combo/TARGET_linux-mips64.mk
+++ b/core/combo/TARGET_linux-mips64.mk
@@ -48,7 +48,7 @@
 endif
 
 # TODO: Enable Clang when its mips64 prebuilt is added
-WITHOUT_CLANG := true
+WITHOUT_TARGET_CLANG := true
 
 include $(TARGET_ARCH_SPECIFIC_MAKEFILE)