[binutils-gdb] Remove regcache_raw_update

[sergiodj+buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT 0b47d9858ca0805cd52ba959276d08899c7b9f8c ***

Author: Simon Marchi <simon.marchi@ericsson.com>
Branch: master
Commit: 0b47d9858ca0805cd52ba959276d08899c7b9f8c

Remove regcache_raw_update

Remove regcache_raw_update, update callers to use
readable_regcache::raw_update instead.

gdb/ChangeLog:

	* regcache.h (regcache_raw_update): Remove, update callers to
	use readable_regcache::raw_update instead.
	* regcache.c (regcache_raw_update): Remove.