llvm: Enable AMDGPU backend for native/native-sdk builds too

(From OE-Core rev: 0053740c01f3ae49292a03686f2a6bad298d3af9)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/llvm/llvm_git.bb

@@ -50,9 +50,7 @@ def get_llvm_host_arch(bb, d):
 #
 # Default to build all OE-Core supported target arches (user overridable).
 #
-LLVM_TARGETS ?= "${@get_llvm_host_arch(bb, d)}"
-LLVM_TARGETS_prepend_class-target_x86 = "AMDGPU;"
-LLVM_TARGETS_prepend_class-target_x86-64 = "AMDGPU;"
+LLVM_TARGETS ?= "AMDGPU;${@get_llvm_host_arch(bb, d)}"
 
 ARM_INSTRUCTION_SET_armv5 = "arm"
 ARM_INSTRUCTION_SET_armv4t = "arm"