kernel: build in CRYPTO_MD5 and CRYPTO_SHA3 for iSCSI CHAP
x86_64 defconfig has neither; LIO needs MD5 for CHAP with open-iscsi,
Windows, VMware and iscsid, so sharedd's CHAP targets refused every login.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>