ctf: Clamp float and integer declaration alignments to 1

ctf: Clamp float and integer declaration alignments to 1

Alignments < 1 don't make much sense, so make sure the stored value is
always at least 1. StructDeclaration was doing this check, but Integer
and FloatDeclaration were not.

Change-Id: Iedb42a6fdda8706b7e8f522df10f67f2145bbba2
Signed-off-by: Alexandre Montplaisir <alexmonthy@voxpopuli.im>
Reviewed-on: https://git.eclipse.org/r/17434
Tested-by: Hudson CI
IP-Clean: Matthew Khouzam <matthew.khouzam@ericsson.com>
Tested-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
Reviewed-by: Matthew Khouzam <matthew.khouzam@ericsson.com>