um: Remove unused cpu_data and current_cpu_data macros

These two macros have no users. Remove them.

Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Author: btw616

arch/um/include/asm/processor-generic.h

@@ -81,8 +81,6 @@ struct cpuinfo_um {
 
 extern struct cpuinfo_um boot_cpu_data;
 
-#define cpu_data(cpu)    boot_cpu_data
-#define current_cpu_data boot_cpu_data
 #define cache_line_size()	(boot_cpu_data.cache_alignment)
 
 #define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf)