misc: sgi_gru: indent SGI_GRU option help text

Fix indentation of SGI_GRU option's help text by adding
leading spaces. Generally help text is indented by two
more spaces beyond the leading tab <\t> character.
It helps Kconfig parsers to read file without error.

Signed-off-by: Prasad Pandit <pjp@fedoraproject.org>
Link: https://lore.kernel.org/r/20240412055221.69411-2-ppandit@redhat.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>