linuxkm/lkcapi_glue.c: implement WC_LINUXKM_C_FALLBACK_IN_SHIMS, km_AesGet(), and km_AesFree(). src/include.am: add missing gates for AES-GCM and AES-XTS asm. wolfcrypt/src/aes_xts_asm.S and wolfssl/wolfcrypt/sp_int.h: don't redefine HAVE_INTEL_AVX2.