ieee802154_shell: Only accept channels within expected range
ieee802154_shell: Only accept channels within expected range

Fixes the following issue:
	"In expression 1UL << chan - 1U, left shifting by more than 31
	bits has undefined behavior.  The shift amount, chan - 1U, is
	4294967295."

Coverity-CID: 167140
Jira: ZEP-2131
Signed-off-by: Leandro Pereira <51c7437a02b34df685e6b4ecb2e9bca23efe2e1a@intel.com>

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