gcc: mark upstream status for all patches

Some patches were missing Upstream-Status informantion,
this commit adds that in those patches.

(From OE-Core rev: 01c3669856538eb34d329780e03df2dc7fb985f2)

Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/gcc/gcc-4.6/gcc-arm-set-cost.patch

@@ -1,3 +1,4 @@
+Upstream-Status:Backport
 2011-08-18  Richard Sandiford  <richard.sandiford@linaro.org>
 
  	gcc/

meta/recipes-devtools/gcc/gcc-4.6/pr32219.patch

@@ -1,3 +1,4 @@
+Upstream-Status:Backport
 Hi,
 
 As suggested by richi.

meta/recipes-devtools/gcc/gcc-4.6/pr46934.patch

@@ -1,3 +1,4 @@
+Upstream-Status:Backport
 2011-09-19  chengbin  <bin.cheng@arm.com>
 
 	Backport r174035 from mainline

meta/recipes-devtools/gcc/gcc-4.6/pr47551.patch

@@ -1,3 +1,4 @@
+Upstream-Status:Backport
 2011-02-02  Richard Sandiford  <richard.sandiford@linaro.org>
 
 	gcc/