ARM: 6629/2: aaec2000: remove support for mach-aaec2000

mach-aaec2000 is no longer actively maintained and is only receiving
fixups to remain building with other kernel updates.

Cc: Bellido Nicolas <ml@acolin.be>
Signed-off-by: Jamie Iles <jamie@jamieiles.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>