fwk: Check parameter in get_hardware_id

BUG=Leila found that if you call this function with an invalid adc
channel, the EC crashes.
TEST=See bug
BRANCH=fwk-main

Signed-off-by: Daniel Schaefer <[email protected]>
(cherry picked from commit c63e94f)

Author: JohnAZoidberg

zephyr/program/framework/src/adc.c

@@ -68,6 +68,9 @@ enum board_version_t get_hardware_id(enum adc_channel channel)
 	int mv;
 	int i;
 
+	if (channel >= ADC_CH_COUNT)
+		return BOARD_VERSION_UNKNOWN;
+
 	mv = adc_read_channel(channel);
 
 	if (mv < 0) {