MIPS: Netlogic: Use PRID_IMP_MASK macro

Use PRID_IMP_MASK macro instead of 0xff00 to extract the processor
type.

Signed-off-by: Jayachandran C <jchandra@broadcom.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/6868/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/include/asm/netlogic/xlp-hal/xlp.h

@@ -99,7 +99,7 @@ void *xlp_dt_init(void *fdtp);
 
 static inline int cpu_is_xlpii(void)
 {
-	int chip = read_c0_prid() & 0xff00;
+	int chip = read_c0_prid() & PRID_IMP_MASK;
 
 	return chip == PRID_IMP_NETLOGIC_XLP2XX ||
 		chip == PRID_IMP_NETLOGIC_XLP9XX;
@@ -107,7 +107,7 @@ static inline int cpu_is_xlpii(void)
 
 static inline int cpu_is_xlp9xx(void)
 {
-	int chip = read_c0_prid() & 0xff00;
+	int chip = read_c0_prid() & PRID_IMP_MASK;
 
 	return chip == PRID_IMP_NETLOGIC_XLP9XX;
 }