arch: Remove the pcstate.hh switching header file.

Change-Id: I8c9cf0ec0c867b76ee8dd8f83b1d2d0835ecb3af
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/52068
Tested-by: kokoro <noreply+kokoro@google.com>
Maintainer: Gabe Black <gabe.black@gmail.com>
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>
diff --git a/src/arch/SConscript b/src/arch/SConscript
index 3f65343..d9c19df 100644
--- a/src/arch/SConscript
+++ b/src/arch/SConscript
@@ -61,7 +61,6 @@
     Split('''
         decoder.hh
         isa.hh
-        pcstate.hh
         vecregs.hh
         '''),
     env.subst('${TARGET_ISA}'))