rs6000: Correct logic to disable NO_SUM_IN_TOC and NO_FP_IN_TOC [PR94065]

rs6000: Correct logic to disable NO_SUM_IN_TOC and NO_FP_IN_TOC [PR94065]

aix61.h, aix71.h and aix72.h intends to prevent SUM_IN_TOC and FP_IN_TOC
when cmodel=large.  This patch defines the variables associated with the
target options to 1 to _enable_ NO_SUM_IN_TOC and enable NO_FP_IN_TOC.

Bootstrapped on powerpc-ibm-aix7.2.0.0

	2020-03-06  David Edelsohn  <dje.gcc@gmail.com>
	PR target/94065
	* config/rs6000/aix61.h (TARGET_NO_SUM_IN_TOC): Set to 1 for
	cmodel=large.
	(TARGET_NO_FP_IN_TOC): Same.
	* config/rs6000/aix71.h: Same.
	* config/rs6000/aix72.h: Same.