Revert "Back off GCC to 4.9.3"

This reverts commit f23f11b41c167f1827c073fa305a46cde1ff4760.

As of linux 4.2 SRA is disabled when building the kernel for ARM.

 https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit?id=a077224fd35b2f7fbc93f14cf67074fc792fbac2

It is suspect that this was the cause of the failure to boot.

Change-Id: If8e5f99f85b8db6e3623e2e77cc2821fdf2ddcb2
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/conf/distro/openbmc-phosphor.conf b/conf/distro/openbmc-phosphor.conf
index f37e88c..e9de087 100644
--- a/conf/distro/openbmc-phosphor.conf
+++ b/conf/distro/openbmc-phosphor.conf
@@ -5,7 +5,6 @@
 DISTRO_VERSION = "0.1.0"
 TARGET_VENDOR="-openbmc"
 
-GCCVERSION ?= "4.9.3"
 IMAGE_FSTYPES += "cpio.gz"
 IMAGE_FSTYPES += "squashfs-xz"
 IMAGE_LINGUAS = "en-us"