[binutils-gdb] Change readonly_p to bool

[sergiodj+buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT 4658f12e9c5ec0d2efb04f1688f6cd6bd9f1a47d ***

Author: Yao Qi <yao.qi@linaro.org>
Branch: master
Commit: 4658f12e9c5ec0d2efb04f1688f6cd6bd9f1a47d

Change readonly_p to bool

This patch changes readonly_p type to bool.

gdb:

2017-04-25  Yao Qi  <yao.qi@linaro.org>

	* regcache.c (struct regcache) <readonly_p>: Change its type
	to bool.
	(regcache_xmalloc_1): Update parameter type and callers update.