hwmon: (occ) Rework attribute registration for stack usage

hwmon: (occ) Rework attribute registration for stack usage

clang produces an output with excessive stack usage when building the
occ_setup_sensor_attrs() function, apparently the result of having
a lot of struct literals and building with the -fno-strict-overflow
option that leads clang to skip some optimization in case the 'attr'
pointer overruns:

drivers/hwmon/occ/common.c:775:12: error: stack frame size (1392) exceeds limit (1280) in 'occ_setup_sensor_attrs' [-Werror,-Wframe-larger-than]

Replace the custom macros for initializing the attributes with a
simpler function call that does not run into this corner case.

Link: https://godbolt.org/z/Wf1Yx76a5
Fixes: 54076cb3b5ff ("hwmon (occ): Add sensor attributes and register hwmon device")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20250610092315.2640039-1-arnd@kernel.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>