ARM: omap1: Kconfig: Fix indentation

The convention for indentation seems to be a single tab. Help text is
further indented by an additional two whitespaces. Fix the lines that
violate these rules.
Signed-off-by: Juerg Haefliger <juerg.haefliger@canonical.com>

Message-Id: <20230315091152.132443-1-juerg.haefliger@canonical.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>