[Offload] Change HSA header search order (#95769)

Summary:
The HSA headers existed previously in `include/hsa.h` and were moved to
`include/hsa/hsa.h` in a later ROCm version. The include headers here
were originally designed to favor a newer one. However, this
unintentionally prevented the dyanmic HSA's `hsa.h` from being used if
both were present. This patch changes the order so it will be found
first.

Related to #95484.

offload/plugins-nextgen/amdgpu/src/rtl.cpp

@@ -58,12 +58,12 @@
 #endif
 
 #if defined(__has_include)
-#if __has_include("hsa/hsa.h")
-#include "hsa/hsa.h"
-#include "hsa/hsa_ext_amd.h"
-#elif __has_include("hsa.h")
+#if __has_include("hsa.h")
 #include "hsa.h"
 #include "hsa_ext_amd.h"
+#elif __has_include("hsa/hsa.h")
+#include "hsa/hsa.h"
+#include "hsa/hsa_ext_amd.h"
 #endif
 #else
 #include "hsa/hsa.h"