arch: posix: posix_cheats: Do not rename types
arch: posix: posix_cheats: Do not rename types

There is no need to rename the POSIX types, so let's not do it to
simplify things
Also remove an unnecessary guard (POSIX_ARCH) to avoid mystifying
this any more than necessary

Related to #13054

Signed-off-by: Alberto Escolar Piedras <52be3174920ed06cbdfbcf9622a1a6c68e942617@oticon.com>

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