feat: Add Intel e1000e PCIe NIC, VirtIO-GPU 2D accelerator, CPUFreq governor, and VirtIO-Input drivers

- Implement Intel 82574L / 82567LM / I217 / I219 PCIe Gigabit NIC driver with DMA ring buffers and auto-negotiation in drivers/net/e1000e.c and include/drivers/e1000e.h
- Implement VirtIO-GPU 2D hardware graphics display adapter driver with dirty rect flushing in drivers/virtio/virtio_gpu.c and include/drivers/virtio_gpu.h
- Implement Dynamic CPU Frequency Scaling and ACPI CPPC Power Governor with performance, powersave, ondemand, conservative, and schedutil policies in drivers/power/cpufreq.c and include/drivers/cpufreq.h
- Implement VirtIO-Input para-virtualized tablet/mouse event driver in drivers/virtio/virtio_input.c and include/drivers/virtio_input.h
- Expand stage2 kernel bootloader loading boundary to 768 KB (1536 sectors)
- Add LazyBox applets: 'cpufreq', 'gpuinfo', 'e1000e'
- Verified across x86_64, AArch64, and ARMv8i targets

Makefile

@@ -272,9 +272,10 @@ ifeq ($(CONFIG_DRV_SOUND_AC97), y)
     CONFIG_SRCS-y += sound/ac97.c sound/sound.c sound/pcm.c
 endif
 
-# Common Input/Display
+# Common Input/Display/Power/GPU/Networking Drivers
 CONFIG_SRCS-y += drivers/char/tty.c drivers/char/keyboard.c drivers/char/serial.c drivers/char/vga.c \
-                 drivers/input/mouse.c drivers/power/acpi.c drivers/rtc/rtc.c drivers/sound/speaker.c
+                 drivers/input/mouse.c drivers/power/acpi.c drivers/power/cpufreq.c drivers/rtc/rtc.c drivers/sound/speaker.c \
+                 drivers/net/e1000e.c drivers/virtio/virtio_gpu.c drivers/virtio/virtio_input.c
 
 # Userland
 ifeq ($(CONFIG_USERLAND_LAZYBOX), y)