linuxkpi: io.h: Do not include asm/set_memory.h for armv6 and armv7

They do not have the same pmap api and this cannot work for those arch.

Fixes: 789dbdbb48574 ("linuxkpi: Add arch_io_{reserve,free}_memtype_wc")
Sponsored by: Beckhoff Automation GmbH & Co. KG

(cherry picked from commit d387a1b4b199630d76b127fded8edbcfecf5a123)