Remove use of SUPPORT_FP_SHARING
Remove use of SUPPORT_FP_SHARING

The Kconfig option SUPPORT_FP_SHARING does not exist.  In fact, it had been
previously renamed to FP_SHARING (this one case was missed).  Fixing this
allows the use of conditional directives in _ExcExit() to be simplified.

Change-Id: I61f98191afe776f70af3c9d9265c38c559be3486
Signed-off-by: Peter Mitsis <22bf95476f8cdbda3c8a9a9bf1bdda876f69ea7a@windriver.com>

runchip/zephyr-cc3220,fractalclone/zephyr-riscv,kraj/zephyr,GiulianoFranchetto/zephyr,jamesonwilliams/zephyr-kernel,sharronliu/zephyr,ldts/zephyr,punitvara/zephyr,kraj/zephyr,Vudentz/zephyr,rsalveti/zephyr,runchip/zephyr-cc3220,bboozzoo/zephyr,tidyjiang8/zephyr-doc,mbolivar/zephyr,explora26/zephyr,mirzak/zephyr-os,bboozzoo/zephyr,punitvara/zephyr,rsalveti/zephyr,aceofall/zephyr-iotos,mbolivar/zephyr,bigdinotech/zephyr,ldts/zephyr,GiulianoFranchetto/zephyr,coldnew/zephyr-project-fork,zephyrproject-rtos/zephyr,pklazy/zephyr,32bitmicro/zephyr,explora26/zephyr,zephyrproject-rtos/zephyr,tidyjiang8/zephyr-doc,mbolivar/zephyr,rsalveti/zephyr,holtmann/zephyr,pklazy/zephyr,bboozzoo/zephyr,Vudentz/zephyr,Vudentz/zephyr,coldnew/zephyr-project-fork,32bitmicro/zephyr,finikorg/zephyr,nashif/zephyr,ldts/zephyr,sharronliu/zephyr,runchip/zephyr-cc3220,tidyjiang8/zephyr-doc,kraj/zephyr,jamesonwilliams/zephyr-kernel,aceofall/zephyr-iotos,sharronliu/zephyr,galak/zephyr,mirzak/zephyr-os,erwango/zephyr,rsalveti/zephyr,pklazy/zephyr,GiulianoFranchetto/zephyr,explora26/zephyr,bboozzoo/zephyr,erwango/zephyr,runchip/zephyr-cc3200,zephyriot/zephyr,bigdinotech/zephyr,galak/zephyr,fbsder/zephyr,coldnew/zephyr-project-fork,finikorg/zephyr,mbolivar/zephyr,jamesonwilliams/zephyr-kernel,zephyriot/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,fractalclone/zephyr-riscv,nashif/zephyr,sharronliu/zephyr,finikorg/zephyr,mirzak/zephyr-os,nashif/zephyr,pklazy/zephyr,32bitmicro/zephyr,runchip/zephyr-cc3200,fbsder/zephyr,erwango/zephyr,fractalclone/zephyr-riscv,nashif/zephyr,kraj/zephyr,32bitmicro/zephyr,fractalclone/zephyr-riscv,mirzak/zephyr-os,Vudentz/zephyr,runchip/zephyr-cc3200,32bitmicro/zephyr,coldnew/zephyr-project-fork,ldts/zephyr,zephyriot/zephyr,runchip/zephyr-cc3220,fbsder/zephyr,fractalclone/zephyr-riscv,bigdinotech/zephyr,coldnew/zephyr-project-fork,punitvara/zephyr,ldts/zephyr,Vudentz/zephyr,aceofall/zephyr-iotos,kraj/zephyr,punitvara/zephyr,erwango/zephyr,runchip/zephyr-cc3200,galak/zephyr,nashif/zephyr,holtmann/zephyr,explora26/zephyr,explora26/zephyr,finikorg/zephyr,mbolivar/zephyr,aceofall/zephyr-iotos,fbsder/zephyr,bigdinotech/zephyr,jamesonwilliams/zephyr-kernel,mirzak/zephyr-os,GiulianoFranchetto/zephyr,galak/zephyr,runchip/zephyr-cc3200,punitvara/zephyr,bboozzoo/zephyr,finikorg/zephyr,holtmann/zephyr,runchip/zephyr-cc3220,GiulianoFranchetto/zephyr,holtmann/zephyr,rsalveti/zephyr,tidyjiang8/zephyr-doc,bigdinotech/zephyr,tidyjiang8/zephyr-doc,zephyrproject-rtos/zephyr,aceofall/zephyr-iotos,holtmann/zephyr,sharronliu/zephyr,fbsder/zephyr,galak/zephyr,zephyriot/zephyr,zephyrproject-rtos/zephyr,erwango/zephyr,zephyriot/zephyr,jamesonwilliams/zephyr-kernel,pklazy/zephyr