move common gdb patches to files/ so they can be used by gdb-cross too

BKrev: 4162d8afmexR1xKdoaFM-lnaBE-yjg

diff --git a/gdb/gdb/libiberty-cross.patch b/gdb/files/libiberty-cross.patch
similarity index 100%
rename from gdb/gdb/libiberty-cross.patch
rename to gdb/files/libiberty-cross.patch

diff --git a/gdb/gdb/sim-install.patch b/gdb/files/sim-install.patch
similarity index 100%
rename from gdb/gdb/sim-install.patch
rename to gdb/files/sim-install.patch

diff --git a/gdb/gdb/uclibc.patch b/gdb/files/uclibc.patch
similarity index 100%
rename from gdb/gdb/uclibc.patch
rename to gdb/files/uclibc.patch