arm/fsl_frdm_k64f: remove kconfig default "n" for PWM
arm/fsl_frdm_k64f: remove kconfig default "n" for PWM

CONFIG_PWM is set to "no" by default, so there is no need
to do it in the SoC kconfig file. Also, setting CONFIG_PWM
there causes kconfig to think that CONFIG_PWM depends on
CONFIG_SOC_FSL_FRDM_K64F and gives warnings about
unmet dependencies if the certain combinations of CONFIG
are set.

Change-Id: I0028accfc4b585dcfa87e0d5733b789691a598e3
Signed-off-by: Daniel Leung <d94e04d205b5962d7873a139ef298b03c1717f72@intel.com>

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