[binutils-gdb] Remove regcache_cooked_write_part

[sergiodj+buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT e4c4a59b48b2cec10cffac4f562937de00cb5f3f ***

Author: Simon Marchi <simon.marchi@ericsson.com>
Branch: master
Commit: e4c4a59b48b2cec10cffac4f562937de00cb5f3f

Remove regcache_cooked_write_part

Remove regcache_cooked_write_part, update callers to use
regcache::cooked_write_part.

gdb/ChangeLog:

	* regcache.h (regcache_cooked_write_part): Remove, update
	callers to use regcache::cooked_write_part.
	* regcache.c (regcache_cooked_write_part): Remove.