meta-phosphor: Remove outdated linux-obmc_4.6.bb

We moved to the 4.7 kernel a long time ago. Remove this unused file to
save confusion.

Change-Id: Idac0cbf4d3063e7f3754e11b501dc32c067d357a
Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/common/recipes-kernel/linux/linux-obmc_4.6.bb b/common/recipes-kernel/linux/linux-obmc_4.6.bb
deleted file mode 100644
index e754d7e..0000000
--- a/common/recipes-kernel/linux/linux-obmc_4.6.bb
+++ /dev/null
@@ -1,5 +0,0 @@
-KBRANCH ?= "dev-4.6"
-LINUX_VERSION ?= "4.6"
-SRCREV="openbmc-20160722-1"
-
-require linux-obmc.inc