arch/riscv: Don't set up virtual memory

Due to changes in the RISC-V Privileged Architecture specification,
Linux can now be started in physical memory and it will setup its own
page tables.

Thus we can delete most of virtual_memory.c.

Change-Id: I4e69d15f8ee540d2f98c342bc4ec0c00fb48def0
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-on: https://review.coreboot.org/23772
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/arch/riscv/boot.c

@@ -27,7 +27,6 @@ void arch_prog_run(struct prog *prog)
 
 	if (ENV_RAMSTAGE && prog_type(prog) == PROG_PAYLOAD) {
 		printk(BIOS_SPEW, "Config string: '%s'\n", config);
-		initVirtualMemory();
 		printk(BIOS_SPEW, "OK, let's go\n");
 		riscvpayload(config, doit);
 	}