phycore_imx8mp: Rework some of the RAM related Kconfig symbols

As the code is today, we get a warning about "select" statements on
"choice" options not doing anything. In this case we can easily fix this
by dropping the select line as the following choice statement handles
things correctly. We also drop the "default false" line as false / n is
the default.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Teresa Remmet <t.remmet@phytec.de>
1 file changed