drivers: display: mb_display: Make display context more compact
drivers: display: mb_display: Make display context more compact

Reorder the struct members for more compact layout. The current row
tracker tracks just values 0 to 2 so uint8_t is more than enough for
it.

Change-Id: I845c84aeb32d59ed0ebbd55d8b6cfda7ad19b75a
Signed-off-by: Johan Hedberg <628991c7b0a19c384f9b99c21ec330ce952bb838@intel.com>

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