efi_loader: enable CONFIG_CMD_NVEDIT_EFI on QEMU

To reduce the default image size CONFIG_CMD_NVEDIT_EFI was disabled by
default. Re-enable it on the QEMU platforms supporting the UEFI sub-system.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/configs/qemu-riscv64_defconfig b/configs/qemu-riscv64_defconfig
index ef84dfd..6f52973 100644
--- a/configs/qemu-riscv64_defconfig
+++ b/configs/qemu-riscv64_defconfig
@@ -7,5 +7,6 @@
 CONFIG_DISPLAY_CPUINFO=y
 CONFIG_DISPLAY_BOARDINFO=y
 CONFIG_CMD_BOOTEFI_SELFTEST=y
+CONFIG_CMD_NVEDIT_EFI=y
 # CONFIG_CMD_MII is not set
 CONFIG_OF_PRIOR_STAGE=y