riscv/spike: Remove obsolete DRAM_SIZE_MB setting

Change-Id: I4077739ac2be09107d8c5a3e4ae7ebd0da3cb876
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-on: https://review.coreboot.org/18147
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
1 file changed