raizing: remove obsolete postload function from base class

Author: happppp

src/mame/toaplan/raizing.cpp

@@ -142,14 +142,6 @@ void raizing_base_state::tx_linescroll_w(offs_t offset, u16 data, u16 mem_mask)
 }
 
 
-
-void raizing_base_state::device_post_load()
-{
-	if (m_tx_gfxram != nullptr)
-		m_gfxdecode->gfx(0)->mark_all_dirty();
-}
-
-
 u32 raizing_base_state::screen_update_base(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
 {
 	bitmap.fill(0, cliprect);

src/mame/toaplan/raizing.h

@@ -52,7 +52,6 @@ class raizing_base_state : public driver_device
 
 protected:
 	u32 screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
-	virtual void device_post_load() override ATTR_COLD;
 
 	// used by everything
 	void create_tx_tilemap(int dx = 0, int dx_flipped = 0);