drivers/console: shell: Decrease maximum line length from 1024 to 256
drivers/console: shell: Decrease maximum line length from 1024 to 256

It's very rare to have lines exceeding 100 characters (default console
width being 80) so 1024 is quite overkill. Even 256 is probably more
than anyone will need any time soon, but if that becomes an issue this
define can be converted to a Kconfig option in the future.

Change-Id: If5fd324b17a0e8ef7b39ea7cc6624739d0241cac
Signed-off-by: Johan Hedberg <628991c7b0a19c384f9b99c21ec330ce952bb838@intel.com>
kraj/zephyr,kraj/zephyr,kraj/zephyr,erwango/zephyr,bboozzoo/zephyr,nashif/zephyr,erwango/zephyr,coldnew/zephyr-project-fork,zephyriot/zephyr,mbolivar/zephyr,32bitmicro/zephyr,kraj/zephyr,32bitmicro/zephyr,bigdinotech/zephyr,aceofall/zephyr-iotos,bigdinotech/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,mbolivar/zephyr,zephyriot/zephyr,ldts/zephyr,coldnew/zephyr-project-fork,kraj/zephyr,aceofall/zephyr-iotos,runchip/zephyr-cc3220,rsalveti/zephyr,zephyrproject-rtos/zephyr,pklazy/zephyr,aceofall/zephyr-iotos,aceofall/zephyr-iotos,finikorg/zephyr,zephyrproject-rtos/zephyr,runchip/zephyr-cc3220,pklazy/zephyr,pklazy/zephyr,bboozzoo/zephyr,mirzak/zephyr-os,sharronliu/zephyr,32bitmicro/zephyr,finikorg/zephyr,runchip/zephyr-cc3220,zephyriot/zephyr,bigdinotech/zephyr,rsalveti/zephyr,fbsder/zephyr,fbsder/zephyr,erwango/zephyr,punitvara/zephyr,bboozzoo/zephyr,tidyjiang8/zephyr-doc,punitvara/zephyr,sharronliu/zephyr,galak/zephyr,runchip/zephyr-cc3200,explora26/zephyr,fractalclone/zephyr-riscv,sharronliu/zephyr,Vudentz/zephyr,GiulianoFranchetto/zephyr,jamesonwilliams/zephyr-kernel,punitvara/zephyr,finikorg/zephyr,32bitmicro/zephyr,punitvara/zephyr,fractalclone/zephyr-riscv,zephyrproject-rtos/zephyr,tidyjiang8/zephyr-doc,holtmann/zephyr,ldts/zephyr,galak/zephyr,fractalclone/zephyr-riscv,explora26/zephyr,fbsder/zephyr,fractalclone/zephyr-riscv,bboozzoo/zephyr,erwango/zephyr,explora26/zephyr,punitvara/zephyr,runchip/zephyr-cc3200,mirzak/zephyr-os,holtmann/zephyr,mirzak/zephyr-os,mbolivar/zephyr,rsalveti/zephyr,erwango/zephyr,bigdinotech/zephyr,runchip/zephyr-cc3200,galak/zephyr,bigdinotech/zephyr,explora26/zephyr,tidyjiang8/zephyr-doc,runchip/zephyr-cc3220,GiulianoFranchetto/zephyr,Vudentz/zephyr,ldts/zephyr,32bitmicro/zephyr,mbolivar/zephyr,explora26/zephyr,coldnew/zephyr-project-fork,Vudentz/zephyr,tidyjiang8/zephyr-doc,tidyjiang8/zephyr-doc,fractalclone/zephyr-riscv,mirzak/zephyr-os,GiulianoFranchetto/zephyr,nashif/zephyr,GiulianoFranchetto/zephyr,zephyriot/zephyr,runchip/zephyr-cc3200,nashif/zephyr,zephyriot/zephyr,fbsder/zephyr,jamesonwilliams/zephyr-kernel,galak/zephyr,runchip/zephyr-cc3200,Vudentz/zephyr,jamesonwilliams/zephyr-kernel,mbolivar/zephyr,coldnew/zephyr-project-fork,ldts/zephyr,rsalveti/zephyr,Vudentz/zephyr,GiulianoFranchetto/zephyr,aceofall/zephyr-iotos,pklazy/zephyr,sharronliu/zephyr,holtmann/zephyr,zephyrproject-rtos/zephyr,mirzak/zephyr-os,coldnew/zephyr-project-fork,fbsder/zephyr,finikorg/zephyr,jamesonwilliams/zephyr-kernel,holtmann/zephyr,finikorg/zephyr,pklazy/zephyr,nashif/zephyr,holtmann/zephyr,Vudentz/zephyr,nashif/zephyr,runchip/zephyr-cc3220,bboozzoo/zephyr,ldts/zephyr,rsalveti/zephyr,jamesonwilliams/zephyr-kernel,sharronliu/zephyr