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 arm

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)

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libicp: unbreak for armv6 after recent OpenZFS import

The following upstream commit:
727497ccdfcc module/icp/asm-arm/sha2: enable non-SIMD asm kernels on armv5/6

does indeed enable sha2 asm for ear

libicp: unbreak for armv6 after recent OpenZFS import

The following upstream commit:
727497ccdfcc module/icp/asm-arm/sha2: enable non-SIMD asm kernels on armv5/6

does indeed enable sha2 asm for earlier arm CPUs, but since libicp's
Makefile was not updated, this leads to:

ld: error: undefined reference due to --no-allow-shlib-undefined: zfs_sha256_block_armv7

Fix it by compiling sha256-armv7.S and sha512-armv7.S for armv6 too.

Fixes: 3494f7c019fc
(cherry picked from commit fb17dfa0c83cc213400fe7e1ed7a39253a4fcefa)

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