regcache_cooked_read -> regcache->cooked_read

regcache_cooked_read -> regcache->cooked_read

Similarly, this patch replaces regcache_cooked_read with
regcache->cooked_read.

gdb:

2018-01-22  Yao Qi  <yao.qi@linaro.org>

	* ia64-tdep.c (ia64_pseudo_register_read): Call
	regcache->cooked_read instead of regcache_cooked_read_unsigned.
	* m32c-tdep.c (m32c_cat_read): Likewise.
	(m32c_r3r2r1r0_read): Likewise.
	* m68hc11-tdep.c (m68hc11_pseudo_register_read): Likewise.
	* xtensa-tdep.c (xtensa_register_read_masked): Likewise.