conf/machine: Remove mpc8315e-rdb machine

This hardware is old/obsolete and unobtainable. Its proving hard to support
with nobody fixing bugs or helping keep the platform running/up to date.

Whilst there is value in real hardware testing, this platform ist just too
old and obsolete to support. This does leave a gap for the power architecture
but at this point there is nobody willing to step up to cover it.

The TSC did discuss and agree support for this platform should be removed.

It calls into question the support/testing of the architecture by Yocto
Project which is being discussed by the TSC and governing board.

(From meta-yocto rev: aa691d49ceb6700eb1881b789fe34f8369bcb0ef)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta-yocto-bsp/conf/machine/mpc8315e-rdb.conf

@@ -1,36 +0,0 @@
-#@TYPE: Machine
-#@NAME: Freescale MPC8315E-RDB
-#@DESCRIPTION: Machine configuration for Freescale MPC8315E-RDB
-
-TARGET_FPU = ""
-
-require conf/machine/include/tune-ppce300c3.inc
-
-KERNEL_IMAGETYPE = "uImage"
-
-EXTRA_IMAGEDEPENDS += "u-boot"
-UBOOT_MACHINE = "MPC8315ERDB_config"
-
-SERIAL_CONSOLES = "115200;ttyS0"
-
-MACHINE_FEATURES = "keyboard pci ext2 ext3 serial"
-
-PREFERRED_VERSION_linux-yocto ?= "5.2%"
-PREFERRED_PROVIDER_virtual/kernel ?= "linux-yocto"
-
-PREFERRED_PROVIDER_virtual/xserver ?= "xserver-xorg"
-XSERVER ?= "xserver-xorg \
-            xf86-video-fbdev"
-
-UBOOT_ENTRYPOINT = "0x00000000"
-
-KERNEL_DEVICETREE = "mpc8315erdb.dtb"
-
-MACHINE_EXTRA_RRECOMMENDS = "kernel-modules"
-
-IMAGE_FSTYPES ?= "jffs2 tar.bz2"
-JFFS2_ERASEBLOCK = "0x4000"
-
-IMAGE_FSTYPES += "wic wic.bmap"
-WKS_FILE ?= 'mpc8315e-rdb.wks'
-IMAGE_BOOT_FILES ?= "u-boot.bin uImage mpc8315erdb.dtb;dtb"