MIPS: Netlogic: select MIPSR2 for XLP

This allows us to use the r2 optimized code from kernel headers
while compilation.

Disable PGD_C0_CONTEXT option for XLP, which does not work.
Signed-off-by: NJayachandran C <jchandra@broadcom.com>
Patchwork: http://patchwork.linux-mips.org/patch/4456Signed-off-by: NJohn Crispin <blogic@openwrt.org>

arch/mips/Kconfig

@@ -1542,6 +1542,7 @@ config CPU_XLP
 	select WEAK_ORDERING
 	select WEAK_REORDERING_BEYOND_LLSC
 	select CPU_HAS_PREFETCH
+	select CPU_MIPSR2
 	help
 	  Netlogic Microsystems XLP processors.
 endchoice
@@ -1755,7 +1756,7 @@ config CPU_SUPPORTS_UNCACHED_ACCELERATED
 	bool
 config MIPS_PGD_C0_CONTEXT
 	bool
-	default y if 64BIT && CPU_MIPSR2
+	default y if 64BIT && CPU_MIPSR2 && !CPU_XLP
 
 #
 # Set to y for ptrace access to watch registers.