kernel/timeout: Fix build breakage due to stdio name collision
kernel/timeout: Fix build breakage due to stdio name collision

Duh: "remove()" is a POSIX symbol, and on at least some platforms
stdio.h can be included here out of platform headers causing a name
collision.

Fixes #10669's direct issue, though the broader issue of how to choose
names for statics remains controversial.

Signed-off-by: Andy Ross <c70f9a6bf6ee0cd69c8af4ce5e6b131945769315@intel.com>

finikorg/zephyr,zephyrproject-rtos/zephyr,explora26/zephyr,Vudentz/zephyr,punitvara/zephyr,galak/zephyr,finikorg/zephyr,GiulianoFranchetto/zephyr,punitvara/zephyr,finikorg/zephyr,ldts/zephyr,GiulianoFranchetto/zephyr,ldts/zephyr,Vudentz/zephyr,nashif/zephyr,punitvara/zephyr,Vudentz/zephyr,punitvara/zephyr,galak/zephyr,galak/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,ldts/zephyr,nashif/zephyr,explora26/zephyr,ldts/zephyr,ldts/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,explora26/zephyr,GiulianoFranchetto/zephyr,Vudentz/zephyr,punitvara/zephyr,explora26/zephyr,GiulianoFranchetto/zephyr,nashif/zephyr,finikorg/zephyr,explora26/zephyr,GiulianoFranchetto/zephyr,finikorg/zephyr,Vudentz/zephyr,galak/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr