[binutils-gdb] Remove regcache_cooked_read

[sergiodj+buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT dca08e1fe158d04517ba3ddd7ece9dd1596c8e8c ***

Author: Simon Marchi <simon.marchi@ericsson.com>
Branch: master
Commit: dca08e1fe158d04517ba3ddd7ece9dd1596c8e8c

Remove regcache_cooked_read

Remove regcache_cooked_read, update callers to use
readable_regcache::cooked_read instead.

gdb/ChangeLog:

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