binutils: update SRCREV to fix powerpc gold link bug

Update to the latest commit on the 2.28 branch to pick up:
a3e00a8 [GOLD] Avoid duplicate PLT stub symbols on ppc32
along with several backported bug fixes for arm*, etc.

This resolves the systemd link error for qemuppc
with the error message:
.../powerpc-oe-linux-ld.gold:
error: invalid STB_LOCAL symbol in external symbols
error: linker defined: multiple definition of '00000001.plt_call.memcpy+8000' command line: previous definition here

described in:

[YOCTO #11696]

---
 meta/recipes-devtools/binutils/binutils-2.28.inc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index 47bfa1a..477bcb2 100644
@@ -18,7 +18,7 @@ BINUPV = "${@binutils_branch_version(d)}"
 
 UPSTREAM_CHECK_GITTAGREGEX = "binutils-(?P<pver>\d+_(\d_?)*)"
 
-SRCREV = "cb44d42ce6ef0c7a4eed7e2a3c272ac102166850"
+SRCREV = "7ea1464297eadebe62aae92ad9bebb33f92c2454"
 SRC_URI = "\
      git://sourceware.org/git/binutils-gdb.git;branch=binutils-${BINUPV}-branch;protocol=git \
      file://0004-Point-scripts-location-to-libdir.patch \

2.7.4