sensor_shell: crash when sensor get <sensor> current

[ycsin]

Describe the bug
Currently, getting any channel >= SENSOR_CHAN_VSHUNT would result in a crash:

uart:~$ sensor get sensor@0 current
[870:26:48.134,000] <err> os: 
[870:26:48.134,000] <err> os:  mcause: 5, Load access fault
[870:26:48.134,000] <err> os:   mtval: 0
[870:26:48.134,000] <err> os:      a0: 0000000080016b36    t0: 000000008000dfc0
[870:26:48.134,000] <err> os:      a1: 0000000000000000    t1: 0000000000000039
[870:26:48.134,000] <err> os:      a2: 0000000000000063    t2: 0000000000000000
[870:26:48.134,000] <err> os:      a3: 0000000000000076    t3: 000000000000000c
[870:26:48.134,000] <err> os:      a4: 0000000080016b37    t4: 0000000000000020
[870:26:48.134,000] <err> os:      a5: 0000000000000063    t5: aaaaaaaaaaaaaaaa
[870:26:48.134,000] <err> os:      a6: 000000000000000a    t6: aaaaaaaaaaaaaaaa
[870:26:48.134,000] <err> os:      a7: 0000000080016b36
[870:26:48.134,000] <err> os:      sp: 0000000080019870
[870:26:48.134,000] <err> os:      ra: 0000000080008b86
[870:26:48.134,000] <err> os:    mepc: 000000008000ddd2
[870:26:48.134,000] <err> os: mstatus: 0000000a00001880
[870:26:48.134,000] <err> os: 
[870:26:48.134,000] <err> os: >>> ZEPHYR FATAL ERROR 0: CPU exception on CPU 0
[870:26:48.134,000] <err> os: Current thread: 0x80016688 (shell_uart)
[870:26:48.144,000] <err> os: Halting system

This is because the SENSOR_CHAN_VSHUNT was added in #60717 but was never added to the sensor_channel_name[SENSOR_CHAN_COMMON_COUNT] table. Since the length of sensor_channel_name is fixed to SENSOR_CHAN_COMMON_COUNT, this means that the index at SENSOR_CHAN_VSHUNT points to NULL. When we use the sensor get command for anything bigger than SENSOR_CHAN_VSHUNT, we will deref that NULL pointer when we do strcmp in the for-loop of parse_named_int:

zephyr/drivers/sensor/sensor_shell.c

Lines 246 to 250 in 4efc035

	for (i = 0; i < count; i++) {
	if (strcmp(name, heystack[i]) == 0) {
	return i;
	}
	}

To Reproduce
Steps to reproduce the behavior:

1. Build the sensor_shell sensor with board that has a sensor, or check-out samples: sensor_shell: add fake sensor driver & pytest #72833
2. sensor get <sensor node> voltage -> ok
3. sensor get <sensor node> current -> crash

Expected behavior
User should be able to get any channel without crashing the application

Impact
sensor get command won't be able to get anything further than voltage, passing number as the arg works though:

sensor get <sensor node> 32 # 32 is SENSOR_CHAN_VSHUNT

Logs and console output
See above

Environment (please complete the following information):

• OS: Unix
• Toolchain: Zephyr SDK 16.5.0-1
• Latest main