riscv: use BIT() marco for cpufeature probing

Using the appropriate BIT macro makes the code better readable.
Suggested-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20220905111027.2463297-5-heiko@sntech.deSigned-off-by: Palmer Dabbelt <palmer@rivosinc.com>

arch/riscv/kernel/cpufeature.c

@@ -289,10 +289,10 @@ static u32 __init_or_module cpufeature_probe(unsigned int stage)
 	u32 cpu_req_feature = 0;
 
 	if (cpufeature_probe_svpbmt(stage))
-		cpu_req_feature |= (1U << CPUFEATURE_SVPBMT);
+		cpu_req_feature |= BIT(CPUFEATURE_SVPBMT);
 
 	if (cpufeature_probe_zicbom(stage))
-		cpu_req_feature |= (1U << CPUFEATURE_ZICBOM);
+		cpu_req_feature |= BIT(CPUFEATURE_ZICBOM);
 
 	return cpu_req_feature;
 }