boards: exp432p401r_launchxl: Remove Flash base address Kconfig setting

Supposed to come from DTS. The Kconfig symbol was removed in commit
311e6b9e3e2b ("arch: arc: Use DTS for all ARC SoCs").

Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>
1 file changed