powerpc: drop MPC85xx_CDS platform support

The MPC8541/8548/8555 Configurable Development System (CDS) were the
vehicle used to provide evaluation of the 1st e500-v2 CPUs around 2007.

Similar to the earlier MPC83xx-MDS systems we removed, the "brains"
exist on a PCI-X card, but additional connectors exist to the right of
the PCI-X slot, two structural metal pins are used to provide stability
in a vertical ATX mounting, and the CPU is now on a daughter-card vs. a
clamped down BGA.

Given the extra complexity and risk of connector damage, the 8548CDS
I had access to came pre-assembled in a basic white Antec case common
for that era, and I'm inclined to assume that was the default.

Power was typical "Pentium4" 2005 ATX - the main 20 pin connector went
to the PCI ATX form factor backplane, and the 4 pin black/yellow went
to the CPU card.

Like previous evaluation boards, they attempted to provide break-out
connectors for as many features as possible, and that made for a fairly
complex looking system.

In any case, these are over 15 years old, and fairly complex systems,
originally made for a small group of industry related people, and made
for use where quiet fan operation wasn't important.  Given that, it
makes sense to remove support from them in 2023.

Signed-off-by: Paul Gortmaker <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Link: https://msgid.link/[email protected]

Author: Paul Gortmaker

arch/powerpc/boot/Makefile

@@ -342,9 +342,6 @@ image-$(CONFIG_MPC834x_ITX)		+= cuImage.mpc8349emitx \
 image-$(CONFIG_ASP834x)			+= dtbImage.asp834x-redboot
 
 # Board ports in arch/powerpc/platform/85xx/Kconfig
-image-$(CONFIG_MPC85xx_CDS)		+= cuImage.mpc8541cds \
-					   cuImage.mpc8548cds_32b \
-					   cuImage.mpc8555cds
 image-$(CONFIG_MPC85xx_MDS)		+= cuImage.mpc8568mds
 image-$(CONFIG_MPC85xx_DS)		+= cuImage.mpc8544ds \
 					   cuImage.mpc8572ds