valgrind: disable for mips32r6/mips32elr6

Fixes [1]:

  /tmp/ccD2Tule.s: Assembler messages:
  /tmp/ccD2Tule.s:682: Error: opcode not supported on this processor: mips32r6 (mips32r6) `movn $2,$4,$7'
  /tmp/ccD2Tule.s:2767: Error: opcode not supported on this processor: mips32r6 (mips32r6) `movn $2,$4,$7'

[1] http://autobuild.buildroot.net/results/f0253d1ed11021d3e5914a5161360de3ef3d1641

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/valgrind/Config.in

@@ -2,7 +2,9 @@ config BR2_PACKAGE_VALGRIND_ARCH_SUPPORTS
 	bool
 	default y if BR2_aarch64
 	default y if BR2_ARM_CPU_ARMV7A
-	default y if BR2_mips || BR2_mipsel
+	# MIPS32 R6 is unsupported
+	default y if BR2_mips && !BR2_mips_32r6
+	default y if BR2_mipsel && !BR2_mips_32r6
 	# MIPS64 R6 is unsupported
 	default y if BR2_mips64 && !BR2_mips_64r6
 	default y if BR2_mips64el && !BR2_mips_64r6