MIPS: fix read_msa_* & write_msa_* functions on non-MSA toolchains

Commit d96cc3d1ec5d "MIPS: Add microMIPS MSA support." attempted to use
the value of a macro within an inline asm statement but instead emitted
a comment leading to the cfcmsa & ctcmsa instructions being omitted. Fix
that by passing CFC_MSA_INSN & CTC_MSA_INSN as arguments to the asm
statements.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/7305/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/include/asm/msa.h

@@ -115,10 +115,10 @@ static inline unsigned int read_msa_##name(void)		\
 	"	.set	push\n"					\
 	"	.set	noat\n"					\
 	"	.insn\n"					\
-	"	.word	#CFC_MSA_INSN | (" #cs " << 11)\n"	\
+	"	.word	%1 | (" #cs " << 11)\n"			\
 	"	move	%0, $1\n"				\
 	"	.set	pop\n"					\
-	: "=r"(reg));						\
+	: "=r"(reg) : "i"(CFC_MSA_INSN));			\
 	return reg;						\
 }								\
 								\
@@ -129,9 +129,9 @@ static inline void write_msa_##name(unsigned int val)		\
 	"	.set	noat\n"					\
 	"	move	$1, %0\n"				\
 	"	.insn\n"					\
-	"	.word	#CTC_MSA_INSN | (" #cs " << 6)\n"	\
+	"	.word	%1 | (" #cs " << 6)\n"			\
 	"	.set	pop\n"					\
-	: : "r"(val));						\
+	: : "r"(val), "i"(CTC_MSA_INSN));			\
 }
 
 #endif /* !TOOLCHAIN_SUPPORTS_MSA */