ARM: OMAP2+: 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.

While at it, remove an extra tab.
Signed-off-by: Juerg Haefliger <juergh@canonical.com>
Message-Id: <20220523063040.10991-1-juergh@canonical.com>
[tony@atomide.com: updated for extra tab]
Signed-off-by: Tony Lindgren <tony@atomide.com>