k20uart: Let's use 'port' everywhere as it is more readable
k20uart: Let's use 'port' everywhere as it is more readable

Using "which" is somehow awkward to use when 'port', on the contrary, is
blatantly more readable.

Change-Id: I355c6e09d7c27b4b07ab6cd10b772a632855516b
Signed-off-by: Tomasz Bursztyka <ba81a3a719836727e6857ae83462b9f52ec41006@linux.intel.com>

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