ICP: AES-GCM: Unify gcm_init_ctx() and gmac_init_ctx()

gmac_init_ctx() duplicates most of the code in gcm_int_ctx() while
it just needs to set its own IV length and AAD tag length.

Introduce gcm_init_ctx_impl() which handles the GCM and GMAC
differences while reusing the duplicated code.

While here, fix a flaw where the AVX implementation would accept a
context using a byte swapped key schedule which it could not
handle. Also constify the IV and AAD pointers passed to
gcm_init{,_avx}().

Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: Rob Norris <[email protected]>
Signed-off-by: Attila Fülöp <[email protected]>
Closes #14529 

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