arch-arm: Remove unused getArmSystem helper

Change-Id: Ifbb1619fa1cfd6c6cda5c390889c423dbe62dc7e
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Ciro Santilli <ciro.santilli@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/25963
Reviewed-by: Gabe Black <gabeblack@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/arch/arm/system.cc

@@ -180,14 +180,6 @@ ArmSystem::initState()
     }
 }
 
-ArmSystem *
-ArmSystem::getArmSystem(System *sys)
-{
-    ArmSystem *a_sys = dynamic_cast<ArmSystem *>(sys);
-    assert(a_sys);
-    return a_sys;
-}
-
 ArmSystem*
 ArmSystem::getArmSystem(ThreadContext *tc)
 {

src/arch/arm/system.hh

@@ -270,13 +270,6 @@ class ArmSystem : public System
     /** Is Arm Semihosting support enabled? */
     bool haveSemihosting() const { return semihosting != nullptr; }
 
-    /**
-     * Casts the provided System object into a valid ArmSystem, it fails
-     * otherwise.
-     * @param sys System object to cast
-     */
-    static ArmSystem *getArmSystem(System *sys);
-
     /**
      * Returns a valid ArmSystem pointer if using ARM ISA, it fails
      * otherwise.