target-arm: Remove ARM_CPUID_* macros

All the uses of ARM_CPUID() to vary behaviour have now been
removed, so we can delete the ARM_CPUID_* macros now.
The one exception is the TI915T/925T, because of its odd behaviour
where the MIDR value can be changed at runtime.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Andreas Färber <afaerber@suse.de>
diff --git a/linux-user/cpu-uname.c b/linux-user/cpu-uname.c
index ddc37be..59cd647 100644
--- a/linux-user/cpu-uname.c
+++ b/linux-user/cpu-uname.c
@@ -35,10 +35,7 @@
      * armv7l; to get a list of CPU arch names from the linux source, use:
      *     grep arch_name: -A1 linux/arch/arm/mm/proc-*.S
      * see arch/arm/kernel/setup.c: setup_processor()
-     *
-     * to test by CPU id, compare cpu_env->cp15.c0_cpuid to ARM_CPUID_*
-     * defines and to test by CPU feature, use arm_feature(cpu_env,
-     * ARM_FEATURE_*) */
+     */
 
     /* in theory, endianness is configurable on some ARM CPUs, but this isn't
      * used in user mode emulation */