drm/etnaviv: etnaviv_cmdbuf.c: Drop the unneeded 'etnaviv_perfmon.h' header

The etnaviv_perfmon.h header is about performance monitor, it can hardly
has something to do with command buffer suballocator. Drop it.

Signed-off-by: Sui Jingfeng <sui.jingfeng@linux.dev>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>

Author: suijingfeng

drivers/gpu/drm/etnaviv/etnaviv_cmdbuf.c

@@ -9,7 +9,6 @@
 #include "etnaviv_gem.h"
 #include "etnaviv_gpu.h"
 #include "etnaviv_mmu.h"
-#include "etnaviv_perfmon.h"
 
 #define SUBALLOC_SIZE		SZ_512K
 #define SUBALLOC_GRANULE	SZ_4K