perf/x86/amd: Remove the repeated declaration

The function 'amd_brs_disable_all' is declared twice in

    commit ada54345 ("perf/x86/amd: Add AMD Fam19h Branch Sampling support").

Remove one of them.
Signed-off-by: Shaokun Zhang <zhangshaokun@hisilicon.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20221108104117.46642-1-zhangshaokun@hisilicon.com

arch/x86/events/perf_event.h

@@ -1320,7 +1320,6 @@ void amd_brs_enable_all(void);
 void amd_brs_disable_all(void);
 void amd_brs_drain(void);
 void amd_brs_lopwr_init(void);
-void amd_brs_disable_all(void);
 int amd_brs_hw_config(struct perf_event *event);
 void amd_brs_reset(void);