obmc-bsp-common.inc: Remove a number of vars

Begin to remove content from this non-sensical file.  Any BSP
configuration should be in a BSP layer, not the phosphor layer.

KERNEL_EXTRA_ARGS: should be set by BSP, and this isn't required at
all at the moment by the currently supported BSPs.

UBOOT_SUFFIX: should be set by a BSP or distro configuration.

MACHINEOVERRIDES: this was nonsensical in the bitbake sense - there
is no such thing as an openbmc machine.  If there is a need for
an openbmc override in the future it can be added as a distro
override (there is no such need at the moment).

MACHINE_FEATURES_BACKFILL_CONSIDERED: BSPs should be considering
backfilled machine features.

Tested: Built witherspoon and palmetto images
Change-Id: Idf252c92cb718d076ea556f2b389f15c13716fd2
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-phosphor/conf/machine/include/obmc-bsp-common.inc b/meta-phosphor/conf/machine/include/obmc-bsp-common.inc
index c402904..7162b5d 100644
--- a/meta-phosphor/conf/machine/include/obmc-bsp-common.inc
+++ b/meta-phosphor/conf/machine/include/obmc-bsp-common.inc
@@ -4,11 +4,6 @@
 
 KERNEL_CLASSES ?= "kernel-fitimage"
 KERNEL_IMAGETYPES ?= "fitImage"
-KERNEL_EXTRA_ARGS += "LOADADDR=${UBOOT_ENTRYPOINT}"
-
-UBOOT_SUFFIX ?= "bin"
-
-MACHINEOVERRIDES =. "openbmc:"
 
 IMAGE_FSTYPES += "${@bb.utils.contains('DISTRO_FEATURES', \
         'obmc-ubi-fs', \
@@ -19,6 +14,3 @@
 INITRAMFS_FSTYPES += "cpio.${INITRAMFS_CTYPE}"
 INITRAMFS_IMAGE ?= "obmc-phosphor-initramfs"
 INITRAMFS_IMAGE_df-obmc-ubi-fs ?= ""
-
-MACHINE_FEATURES_BACKFILL_CONSIDERED = "qemu-usermode"
-