[binutils-gdb] Call cooked_read in ppu2spu_prev_register

[sergiodj+buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT d679c21a43852305c5eeae957854f6e13d6f884c ***

Author: Yao Qi <yao.qi@linaro.org>
Branch: master
Commit: d679c21a43852305c5eeae957854f6e13d6f884c

Call cooked_read in ppu2spu_prev_register

The code in ppu2spu_prev_register is in fact regcache_cooked_read,
because spu doesn't have gdbarch method pseudo_register_read_value.

gdb:

2018-01-18  Yao Qi  <yao.qi@linaro.org>

	* ppc-linux-tdep.c (ppu2spu_prev_register): Call cooked_read.