libicp(_rescue)?: use asm versions for all 32-bit arm flavors

OpenZFS upstream refactored the asm versions of sha2 to be usable on all
32-bit arm flavors, so it is not necessary to limit this to armv6 and
armv7.

Suggested by: jhb

(cherry picked from commit bc6051a060f7f39540e284f2934e61411590dbfd)