MIPS: cevt-r4k: Use CAUSEF_TI, CAUSEF_PCI constants

Use CAUSEF_TI and CAUSEF_PCI constants from asm/mipsregs.h rather than
the magic values (1 << 30) and (1 << 26).

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/9124/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/oprofile/op_model_mipsxx.c

@@ -246,7 +246,7 @@ static int mipsxx_perfcount_handler(void)
 	unsigned int counter;
 	int handled = IRQ_NONE;
 
-	if (cpu_has_mips_r2 && !(read_c0_cause() & (1 << 26)))
+	if (cpu_has_mips_r2 && !(read_c0_cause() & CAUSEF_PCI))
 		return handled;
 
 	switch (counters) {