MIPS: CPC: Use __raw_ memory access functions

The CPC registers use native endianness, so using plain readl & writel
will produce incorrect results on big endian systems.

Reported-by: Jeffrey Deans <jeffrey.deans@imgtec.com>
Reported-by: Keng Koh <keng.koh@imgtec.com>
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/6657/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/include/asm/mips-cpc.h

@@ -75,13 +75,13 @@ static inline bool mips_cpc_present(void)
 #define BUILD_CPC_R_(name, off) \
 static inline u32 read_cpc_##name(void)				\
 {								\
-	return readl(mips_cpc_base + (off));			\
+	return __raw_readl(mips_cpc_base + (off));		\
 }
 
 #define BUILD_CPC__W(name, off) \
 static inline void write_cpc_##name(u32 value)			\
 {								\
-	writel(value, mips_cpc_base + (off));			\
+	__raw_writel(value, mips_cpc_base + (off));		\
 }
 
 #define BUILD_CPC_RW(name, off)					\