intel/brw: Use brw_analysis prefix for liveness analysis files

Move declaration to the common header and rename definition file.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33048>

src/intel/compiler/brw_opt_dead_code_eliminate.cpp

@@ -22,7 +22,7 @@
  */
 
 #include "brw_fs.h"
-#include "brw_fs_live_variables.h"
+#include "brw_analysis.h"
 #include "brw_cfg.h"
 
 /** @file