media: atomisp: remove the repeated declaration

Function 'ia_css_mmu_invalidate_cache' is declared twice, remove the
repeated declaration.

Link: https://lore.kernel.org/linux-media/1621922559-1859-1-git-send-email-zhangshaokun@hisilicon.comSigned-off-by: Shaokun Zhang <zhangshaokun@hisilicon.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/staging/media/atomisp/pci/atomisp_compat.h

@@ -83,8 +83,6 @@ int atomisp_q_dis_buffer_to_css(struct atomisp_sub_device *asd,
 
 void ia_css_mmu_invalidate_cache(void);
 
-void ia_css_mmu_invalidate_cache(void);
-
 int atomisp_css_start(struct atomisp_sub_device *asd,
 		      enum ia_css_pipe_id pipe_id, bool in_reset);