crypto-native: fix multi-arch variant initialization

crypto-native: fix multi-arch variant initialization

crypto_native/main.h is being built as default,
and crypto_native_main is initialized with a size of 64 bytes.

crypto_native/aes_gcm.c and crypto_native/aes_cbc.c are march
variants, their ICL variants are expecting crypto_native_main
to be 256 bytes.

Type: fix

Signed-off-by: Georgii Tkachuk <[email protected]>
Signed-off-by: Fan Zhang <[email protected]>
Signed-off-by: Ray Kinsella <[email protected]>
Change-Id: I4cddb75b712ea83c9cfca621887605d7bae104ec