fix(boards/corvon): unquote BOARD_UAVCAN_INTERFACES

BOARD_UAVCAN_INTERFACES is an int with a default of 2, so the quoted "1" was
not a valid value. Kconfig discarded the assignment and fell back to the
default, and 743v2 has been building with two interfaces on a board its own
header describes as "CAN (FDCAN1) - single interface".

The value reaches compiled code as -DUAVCAN_NUM_IFACES via
config_uavcan_num_ifaces, where it sizes _can_status_pub_handles[] and makes
the logger advertise two can_interface_status instances. The driver iterates
the runtime interface count rather than this constant, so nothing polls
absent hardware; the cost is a spare handle and a phantom log instance.

Verified with kconfiglib: the value now resolves to 1, matching 743v1 and
every other board that sets it. The board_config.h comment documented the
quoted form, so it is corrected too rather than left to spread.

Assisted-by: Claude:claude-opus-5
Signed-off-by: Ramon Roche <mrpollo@gmail.com>

boards/corvon/743v2/default.px4board

@@ -6,7 +6,7 @@
 
 CONFIG_BOARD_TOOLCHAIN="arm-none-eabi"
 CONFIG_BOARD_ARCHITECTURE="cortex-m7"
-CONFIG_BOARD_UAVCAN_INTERFACES="1"
+CONFIG_BOARD_UAVCAN_INTERFACES=1
 CONFIG_BOARD_ROMFSROOT="px4fmu_common"
 CONFIG_BOARD_ETHERNET=n
 CONFIG_BOARD_SERIAL_GPS1="/dev/ttyS2"

boards/corvon/743v2/src/board_config.h

@@ -223,7 +223,7 @@
 
 /****************************************************************************************************
  * CAN (FDCAN1) - single interface, statically configured via
- * CONFIG_BOARD_UAVCAN_INTERFACES="1" in default.px4board.  Do NOT define
+ * CONFIG_BOARD_UAVCAN_INTERFACES=1 in default.px4board.  Do NOT define
  * UAVCAN_NUM_IFACES_RUNTIME here (that forces us to implement
  * board_get_can_interfaces() at the board level).
  ****************************************************************************************************/