Add new RISC-V 64-bit QEMU configuration with:
- 64-bit RISC-V (RV64) architecture support
- RISC-V Vector Extension (RVV/V-extension) enabled
- LVGL graphics framework integration
- VirtIO GPU and input device support
- NSH shell with built-in applications
This configuration enables developers to build and test LVGL graphical
applications on 64-bit RISC-V targets with Vector extension support,
providing a foundation for future SIMD optimization work.
Includes:
- defconfig: Complete configuration file with all necessary options
- Updated index.rst: Build and run instructions with QEMU launch command
Signed-off-by: rongyichang <rongyichang@xiaomi.com>
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