ARM: Drop unreferenced CONFIG_MACH_* defines

These macros are all defined once and never checked or used anywhere:

CONFIG_MACH_ASPENITE
CONFIG_MACH_DAVINCI_CALIMAIN
CONFIG_MACH_DOCKSTAR
CONFIG_MACH_EDMINIV2
CONFIG_MACH_GOFLEXHOME
CONFIG_MACH_GONI
CONFIG_MACH_GURUPLUG
CONFIG_MACH_KM_KIRKWOOD
CONFIG_MACH_OPENRD_BASE
CONFIG_MACH_SHEEVAPLUG

Almost all of them were only used for the mach_is_foo() logic in
arch/arm/asm/mach-types.h that were dropped in
commit f9dadaef ("arm: Re-sync asm/mach-types.h with
Linux Kernel v4.9")

Signed-off-by: Tuomas Tynkkynen <tuomas@tuxera.com>