drivers/perf: riscv: Remove redundant macro check

The macro CONFIG_RISCV_PMU must have been defined when riscv_pmu.c gets
compiled, so this patch removes the redundant check.

Signed-off-by: Xiao Wang <xiao.w.wang@intel.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Link: https://lore.kernel.org/r/20240708121224.1148154-1-xiao.w.wang@intel.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

Author: XiaoWang1772

drivers/perf/riscv_pmu.c

@@ -39,15 +39,13 @@ void arch_perf_update_userpage(struct perf_event *event,
 	userpg->cap_user_time_short = 0;
 	userpg->cap_user_rdpmc = riscv_perf_user_access(event);
 
-#ifdef CONFIG_RISCV_PMU
 	/*
 	 * The counters are 64-bit but the priv spec doesn't mandate all the
 	 * bits to be implemented: that's why, counter width can vary based on
 	 * the cpu vendor.
 	 */
 	if (userpg->cap_user_rdpmc)
 		userpg->pmc_width = to_riscv_pmu(event->pmu)->ctr_get_width(event->hw.idx) + 1;
-#endif
 
 	do {
 		rd = sched_clock_read_begin(&seq);