scsi: aic7xxx: aic79xx: remove VLAs

scsi: aic7xxx: aic79xx: remove VLAs

In preparation to enabling -Wvla, remove VLAs and replace them with
fixed-length arrays instead.

The arrays fixed here, using the number of constant sections, aren't
really VLAs, but they appear so to the compiler. Replace the array sizes
with a pre-processor-level constant instead using ARRAY_SIZE.

This was prompted by https://lkml.org/lkml/2018/3/7/621

Signed-off-by: Stephen Kitt <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>