Add EPD waveform controller for Nook Glowlight 4 Plus (bnrv1300)

[backcountrymountains]

Summary

The Nook Glowlight 4 Plus (bnrv1300) uses an AllWinner "Emperor" platform that is architecturally distinct from the GL4/4e (Freescale NTX). This PR splits it into its own DeviceInfo ID and adds a dedicated EPD controller that enables GC16 waveform without root or a Magisk module.

• DeviceInfo.kt: split bnrv1300 from the NOOK_GL4 group into NOOK_GL4PLUS
• EPDFactory.kt: route NOOK_GL4PLUS to NookEmperorEPDController instead of NGL4EPDController
• NookEmperorEPDController.kt: new controller using ViewRootImpl.setRefreshMode via reflection
• TestActivity.kt: add "Nook GL4 Plus" entry to the EInk test driver map (per @hugleo's request in Add lights support for Nook Glowlight 4 Plus (bnrv1300) #592)

How it works

B&N's Android 8.1 firmware adds setRefreshMode(int) directly to ViewRootImpl. The controller reaches it via reflection and the call routes through SurfaceFlinger → HWC (hwcomposer.virgo.so) → hwc_set_layer_refresh_mode → layer->refreshMode → /dev/disp ioctl. Because HWC reads layer->refreshMode during composition, the waveform is applied to the correct (incoming) buffer.

Fallback order if reflection fails:

1. ViewRootImpl.setRefreshMode — B&N Android 8.1 (preferred, confirmed working)
2. SurfaceControl.setRefreshMode via mSurfaceControl field — AOSP Android 10+
3. sysfs force_update_mode write — last resort, requires Magisk epd_gc16 module

Testing

Confirmed on a Nook Glowlight 4 Plus running B&N Android 8.1 (bnrv1300):

• ViewRootImpl.setRefreshMode path active on launch (logged)
• GC16 (mode=0x4) confirmed in kernel dmesg (mode=0x200004) on full-page refreshes
• No root, no Magisk module, no ADB setup required — works on a stock rooted device with Magisk module disabled

No setup required

Unlike some EPD drivers, this controller needs no ADB properties, no appops grants, and no Magisk modules. No wiki page is needed.

🤖 Generated with Claude Code

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This change is

[backcountrymountains]

Rebased onto master after #592 merged and resolved conflicts:

• DeviceInfo.kt: only a comment-text conflict; kept the more descriptive (AllWinner "Emperor" platform) wording.
• EPDFactory.kt: Add lights support for Nook Glowlight 4 Plus (bnrv1300) #592 had placed NOOK_GL4PLUS in the NGL4 group; removed it from there since this PR gives it a dedicated NookEmperorEPDController case.

Also fixed all Codacy "Unnecessary long whitespace" warnings in NookEmperorEPDController.kt — aligned = in the const val block, aligned = in the single-expression override fun bodies, and an extra space before ?: in surfaceControlSetMode.