drm/sun4i: DEBE 硬件光标电量 overlay - #3
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新增内核 patch 0020：用 suniv DEBE 的硬件光标(HWC)在屏幕右上角画
一个 64x64 1bpp 电池图标 + 电量百分比，独立于 DRM master 常驻显示。
HWC 是 alpha blender0 里优先级最高的独立块，DRM 从不碰它的 pattern/
palette SRAM，只动 MODCTL 的 LAY_EN 位，因此这里写下的内容不受任何
atomic commit 影响。仿现有 srgn_splash 直接从 sysfs 驱动：
/sys/kernel/battery_hwc/{enable,percent,color,show_percent}
寄存器布局按 F1C200s 手册：pattern 0x1400(512B)、palette 0x1600。
电量由 userspace 推入，驱动本身不读 GPADC。已单文件交叉编译通过。
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AtavuKBY8vmGTEfjac43ZK
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新增内核 patch 0020：用 suniv DEBE 的硬件光标(HWC)在屏幕右上角画
一个 64x64 1bpp 电池图标 + 电量百分比，独立于 DRM master 常驻显示。
HWC 是 alpha blender0 里优先级最高的独立块，DRM 从不碰它的 pattern/ palette SRAM，只动 MODCTL 的 LAY_EN 位，因此这里写下的内容不受任何
atomic commit 影响。仿现有 srgn_splash 直接从 sysfs 驱动：
寄存器布局按 F1C200s 手册：pattern 0x1400(512B)、palette 0x1600。 电量由 userspace 推入，驱动本身不读 GPADC。已单文件交叉编译通过。
Claude-Session: https://claude.ai/code/session_01AtavuKBY8vmGTEfjac43ZK