Revert "riscv: Allow use of reset drivers"

This reverts commit 958a3f46.

A more appropriate change below is already in mainline.
Commit fd31e4fd ("riscv: Do not build reset.c if SYSRESET is on")

Revert this patch, so that U-Boot can be built successfully for
SiFive Fu540 board.
Signed-off-by: NBin Meng <bin.meng@windriver.com>
Reviewed-by: NSean Anderson <seanga2@gmail.com>
Reviewed-by: NLeo Liang <ycliang@andestech.com>

arch/riscv/lib/reset.c

@@ -7,7 +7,6 @@
 #include <command.h>
 #include <hang.h>
 
-#ifndef CONFIG_SYSRESET
 int do_reset(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 {
 	printf("resetting ...\n");
@@ -17,4 +16,3 @@ int do_reset(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 
 	return 0;
 }
-#endif