[binutils-gdb] Remove regcache_register_status

[sergiodj+buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT 0ec9f11447514a797ae13760825fa45f9deedd8c ***

Author: Simon Marchi <simon.marchi@ericsson.com>
Branch: master
Commit: 0ec9f11447514a797ae13760825fa45f9deedd8c

Remove regcache_register_status

Remove regcache_register_status, change callers to use
reg_buffer::get_register_status directly.

gdb/ChangeLog:

	* regcache.h (regcache_register_status): Remove, update callers
	to use reg_buffer::get_register_status directly instead.
	* regcache.c (regcache_register_status): Remove.